Started and finished Another yesterday, gonna give some thoughts here.
I got into this anime after watching a scene from it that *insert super heavy spoiler gore (not really gore, but blood)* thanks Vines and Cracks
I really liked how the background and the history of the place was told, how it managed to confuse me at the start. The main concept of the story is how humans try to survive in that class and how it ended badly between them. The backstory of the class, how the main character find out what himself had got into, etc. I also liked Mei Misaki, because she is just interesting enough to creep me out at the start, and the horror in this anime is something that I wanted to see for a long time. It's cool unless you can't stand with dolls, creep out deaths.