Otokojuku is the funniest shit in the world there is this school and it's super fun and they are a bit fascist but the author knows and it's super fun and everyone loves it. If you can understand beauty and art (or even just life) you cannot not enjoy it. Then after the first few volumes it becomes another manga. Otokojuku (after the first volumes) is an 80's manga in which very masculine men fight and die and laugh together. Whether Otokojuku (after the first volumes) is a good manga in which such things happen depends on what the reader means by good manga. If "manga" is aform of entertainment or a means for the author to showcase his skills and ideas, Otokojuku (after the first volumes) is sadly not a very well performed manga, it follows a very weak plot, the stakes are very low, the characters don't really do much beside being masculine, it's artwork is not aging very gracefully and while it can sometimes make you smile there are many many funnier things to read in the genre.

On the other hand, if "manga" is a format through which you (You! Not the author) explore other people's stories, then Otokojuku (after the first volumes) is still not a perfect manga (as the level of alienation you must suffer to "get into it" is much higher than in other series) but still it can help you reach a unique and honest perspective, which is something "bad" manga is not able to do.

I believe you can grow a tiny bit, or you can at least learn something new while reading Otokojuku(after the first volumes) . Just be aware it can be a bit of a struggle.

Still the start of the manga is really fun so if you don't care about the rest you can just read that and it's fun and nice and cool.