Friends-eater classroom is a complete mess of a manga. I would not recommend reading this at all. If you want to read it just because there are some gore scenes, skip it. There are other gore mangas that do it a lot better.

Story: 2/10
I was actually surprised to see that the manga subverted some expectations and had some twists to the usual clichés of the genre. I would have loved it a lot if the execution wasn't that atrocious. The manga suffers from a weird pacing issue: even as the game progresses, you can't really sense a "progression" in the story. Characters behave the same way in game 15 as they did in game 3.

Art: 6/10
The artist does a decent job, but that's all there is to it. Characters have a pretty generic look and the gore is ok.

Character: 1/10
Jesus christ this is bad. This is really bad. A student sees another student that they really like dying right in front of them and they're a-ok in the next day. The characters feel so unrealistic that it alienates us the readers quite a lot.

Enjoyment: 3/10
Eh, it could be worse.

Overall: 3/10
I definitely don't recommend it. Skip this one.