its so far the best anime I've ever watched, its really worth it. it is dramatic funny emotional and deep at the same time. really intense. it makes sense, also the storyline is brilliant. I am literally running short on words. can't express it in words. if you haven't watched or read it twice or thrice, then you haven't read/ watched. the songs used as background/intro/outro are also addictive. i am listening one while typing this review. ^-^
(song name is Shogeki from season 4, listen it twice and its your next fav song)
so ya, go for this amazing worth it anime series.
RIP Sasha Braus season 1 - season 4 T-T