This was my biggest problem with the movie.
I know little about comics and just wanted to watch the "new Batman movie". I was a big fan of Nolan's trilogy (and Tim Burton's, way before that).
Not having read much about it, what I found at the theatre was that the title of the movie is completely misleading, maybe to attract fools like me (I never payed any attention to the subtitle "Dawn of Justice" either).
Only now I'm understanding that this was some sort of introduction to the Justice League movie(s) that will be coming out - something which I never really cared about and won't definitely be caring now after watching this movie.
In the end, it was a big disappointment for me, although I understand that part of it is my fault.
I wonder if I was the only one in this situation, or if the bad reputation the movie is having is a reflection of other people feeling the same.
Ironically, and as a final note, what I liked most about it was the one thing I had doubts ever since I first heard about it: Ben Affleck as Batman.