I have read up to 40 chapters. I can't read more cause I'm broke but anyway let me list out the things that I like:
There are little to no grammatical errors. So you can pretty much read it smoothly.
The world-building is great. The author set it up really well. There is no big info dumps about the world. At least for me, the author made the information about the world digestible. It didn't feel like explaining the world as if it's a textbook, explaining it for the sake of explaining but it feels like an adventure.
This can be seen in the background of the MC. Instead of just simply explaining his background for one chapter or a paragraph, the author did a good job makin us curious about MC's background and showing it bit by bit instead of one big infodump. So for the people who read the first few chapters and think that the MC is stupid, bare with it as it will be explainin soon why he thought of it that way.
MC:
The MC is kinda developing in the first 40 chapters. You will know his morality, his priorities, his goal, and his character.
If you're looking for a character that is calculative and will sacrifice anyone for his own goal, then no this is not a novel for you. The MC here is stupidly honest which is kinda refreshing. He can easily emphasize with anyone. Knows when he's fcked up and trying to adapt to this new world. He doesn't seem like a hypocrite so far.
For the side characters:
I'm liking the side characters so far, there might be cliches on them but the dialogs seem like something can come out from a human. I don't know how developed are they because I've only read up to chapter 40 but I'm already liking some of them.
The things that I don't like:
There are very slight spoilers ahead so be warned. They aren't big revelations. One of them is already in the tags lol.
He has a system and it seems like he's the only one who has it. I like novels that has system if everyone has it, if it's only the MC I kinda don't like cause it undermines the future achievements of the MC. You can't help but sometimes think "If I have a system, then I'm pretty sure I can also do it." It doesn't make the MC special. It doesn't feel like he earned it. Yeah, you can say that the system didn't give it in a silver platter but you can also see how much of an advantage having a system is. Also, how can you say he's special if there's no one you can compare it to (i.e. other people having systems too). HOWEVER, that's the genre of the book so that's on me for reading it (I'm actually kinda hoping that everyone has the same system but yeah).
The one that I dislike is him having a skill just by opening a book. This is just OP. I'm pretty sure we can all agree that he didn't earn it. For me, the appeal of weak to strong is the grind. And you can't remove hard work from grinding so if someone can earn a skill by just simply opening a book although it cost pain (which is just a few sentences) I'm sorry but I can't see the hard work there. I'm hoping that it's just an early boost but I would respect the author's decision and hope they have a better plan for it. But hey that's just me and if you like the MC having that skill then read it and I recommend you to read it cause it's really good this is just me not liking a small part of it. Don't let a random guy ruin what you like.
TL;DR
This book is really great, Great World Building, Great Writing quality, Consistent Updates, Good story development, Great MC but a little bit of nitpick on some things that are related to the MC, would really recommend it to others.