If you want an honest answer to your question, here are my reasons off the top of my head:
- Wonder Woman was completely extraneous to the plot. Remove her and nothing changes.
- Wonder Woman took away and distracted from the central theme of Batman vs Superman.
- Batman vs Superman was more than enough for a full movie on its own.
- Aquaman, Flash and Cyborg introduced by fucking e-mail attachment?
- So the only reason Batman and Wonder Woman ever hear of these people is because they were on Lex Luthor's hard drive?
- Jesse Eisenberg's performance.
- Why did you say that name?!??!?!?!
- Jesse Eisenberg's performance.
- Dream sequence inside a dream sequence.
- So Superman's ship can create the undead?
- So Lex Luthor dripping his blood into an alien jacuzzi turns dead Zod into Doomsday? WTF? Without hinting at any of this beforehand?
- Why is Luthor even doing any of the shit he is doing? Does anyone know?
- Jesse Eisenberg's performance.
- Never see Wonder Woman's lasso or know she has one until we cut to it already around Doomsday.
- Ding! Ding! Ding! He's coming!!!
Etc., etc.