Managed 67 chapters could not go further. 

Is it bad? Not really but it isn't good. 

Characters act as if they are 12-14 whilst they are 17-19. 

FMC's boyfriend is a total mess and up to chapter 67 ONLY HE HAS PROBLEMS while our Marry Sue doesn't have any problems. I waited long for at least some mention of her social media sickness but apparentely it isn't a problem. 

Her boytoy is improving of course but he is feminine, weak and fickle. That feeling that he jugs female hormones every day didn't dissapear. While he was fat and nerdy he had some semblence as boy though weak now he seems more girly. (Usually after getting fit men become more masculine due to hormonal changes i.e. fat - produces female hormones, training - produces male hormones). 

Lastly what actually made me quit is illogical plot points and artificial drama. Almost if not every arc and dramatic point is FAKE by fake i mean it doesn't touch with reality which for me breaks immersion. 

P.S. I'm an adult male if i weren't an adult and inexperienced likely i would ignore many things. Due to the fact that i'm a male i KNOW guys and many guys here seem like a flawed represantion by a female.

Standard Japanese manga - meaning we have a standard herbivore Japanese MC. The problem? Like Nadrious said the EQ and IQ of our MC is lacking. He might be a good chemist but everything else is lacking. 

Why is it a problem? This manga tries to dabble both in comedy and drama. Creates dramatic plot points while macking our MC dumb in general but smart in current situation. Many problems could have been resolved but are being shadowed by action-comedy-gag manga. 

You transmigrate to another world? Instead of thinking how lovely your wife is, you would normally try to understand who you are and what  you are. 

Need an alias why you changed? You hit your head and got an amnesia. This is normal and plausible. 

A grown a s s man acting like a high schooler in your standard Japanese school life rom-com. 

Lastly this looks like more of a propaganda manga to stimulate young Japanese males (before age of 15) to take interest in science studies i.e. chemistry in this case. Though instead of motivating them becoming interested in science i think they should motivate them to act like normal men to stop their active depopulation.

It's interesting. 

If you are a fan of action-comedy it might just around your corner. 

One thing that was a major con for me is the stupidity. 

It feels like MC is stupid but compared to everyone else he is smart. Which implies that author needed to make the whole world stupid just to make this story. 

Barbarians are around 60-80 IQ

Humans(and elves) are around 80-100 IQ

I know it's not the perfect metric but it roughly explains how it feels. Also MC isn't 100 iq, he is around 90-95. A bit dumb and goofy. 

Its boring. 

MC is OP. He is super kind and dense. 

Ended at 188, i just could not read anymore. 

I'm okay with OP but it has to be handled more maturily yet it is shounen and shares shounen logic and simplicity. 

In reality it's a story about bland godlike figure and bunch of girls trying to please this godlike figure. (Because he is super generous and good). 

His main partner became a background character and a servant. Story concentrates more about crazy dragon-girls and pis**** human princesses. 

Now add all the medievel fantasy troupes + modern Japanese nonsence. (Vacations, idols and some other stuff). 

Can you honestly immerse yourself? I could not. (fasn't even funny for me) Suspencion of disbelief...ruined. 

It's not bad per se bad lacks logic, direction and because of that it is boring. YOu could say it's self insert wet fantasy, but i cannot self-insert myself to a goofy, stupid and overly kind people. (Maybe it's just me)

I might have bitched a little in the comment section but genuinely it's a good manga. 

Progression seems to be over dramatic or stalled at times but it keeps on moving. Main couple actually progresses and it seems that it won't be Rent A girlfriend v2. 

Characters are not one dimensional and it looks like they have some real depth to them (though a bit over dramatic for me)

Plot is progressing and dynamic doesn't feel artaficial which quite good considering that mangakas tend to have that problem.

Give it a read, despite the setting being school life it seems to have some semblance with reality. Feels like someone who wrote it actually thought through what they were willing to write. (wrote this after reading chapter 33)

A solid 4.6/5 in my opinion 

Standard isekai-like story. 

MC has no character, he is super kind yes man. 

Pretty dumb and indecisive. 

Has a female orbiters around him who want him but he always stops them or sudden interruptions come. 

Concept of the story is interesting. Story itself though? Boring and bland. Characters are 1 dimensional. MC has no dimensions at all. 

3/5 Only because i can't rate it as 2.5/5. It's medioacre, brings nothing to the table except the concept. (Guess why it was AXED after 40ch...considering that novel has a lot more content which was also bashed by people.)

It's rare. 

MC is a MAN, meaning he has intimate relationship women and actually has some game. You may question his commitment but at least he isn't your usual c a s t r a ted MC. 

Next point is that it might seem comedic and silly at some points but it does retain the reality of things. 

For example, you are a bad person who does awful things? Get ready to die. Bad people actually get killed. 

5/5 Unique, goes against usual stream of fecal matter that we get from manga and retains the touch of reality

Wanted to rate 3/5 but due to recent mangas/huas/was being so low quality i think 4/5 is good mark of this one. 

A lot of frutrating moments MMC and FMC are dumpster fires they are (more MMC than FMC) like a compilation of people with problems not to mention i get the feeling they were living in the bubble. I understand why, it's to be entertaining (creating chaos and drama) but also to guide younger generations through problems with more or less practical guide to relationship, some things are effective. 

On the other hand there is a lot smoothing over the edges. Some of the actions, decisions and words would need a lot of time to get processed/healed/resolved but author tends to sweep those things under the rug as if those things are comparitively minor. My biggest grind was MMC relationship with his mother, so called stepfather and stepsister. (some things are unforgivable and some are just too awkward but asian fillial piety is idiotic in many cases due to major differences with our 21st century and 20th century and below). 

All in all it's not bad, it's fun a little overdramatic (just too much red flags) but you should consume with grain of salt it's foreign for western audience and even aged for Korean society). 

The one who placed 1 has some real problems with literature especially a historical peace. 

Too much decapitation? Graping? Maybe even Lu Bu actions and 0 consequnces? 

Well tough luck snowflakes this kind of stuff is still happening even today, you are just defended by "polite" society that will likely cease to exist soon in part due to your weakness. 

4/5 Not bad, has it's flaws but is quite a good historical piece. Like i stated it doesn't shy away from showing us what those times represented. 

Managed to read only 5 chapters. 

Standard hero isekai 

Standard paragon of virtue MC

Standard dumb stuff

Evil guys are well evil, they aren't smart nor their deeds are smart. 

Why it worse than average? 40y old guy power fantasy. I understand teenagers having those delusional fantasies but a 40y old guy? Screams like mid-life crisis. 

Tired of doormat MC's? 

Do not like OG perverted MC's? 

Then read this, 12th grader found a beauty. Did he stay idle? No. Did he wait for "lucky" moments? No. 

He learned the game and took action like a normal man, despite her being older than him and potential enemies lurking beyond horizon, he didn't wimp out and decided to do something! 

It's like a doujin with actual plot.
As a escapism power fantasy not bad. Though MC rarely meets any opposition.
MC is a somewhat lawful evil predator. He uses many tricks to bed women but never outright physical ra** (except maybe one case). 
In any case:
MC is not a pushover
MC is somewhat smart and not dense
There is some character development
There is actual plot and reasons for everything

As for cons:
Too much harem members
Too much s** 
Too much forced s** (subjective)
Somewhat rushed ending (if 74 is ending)