Alright, I saw Batman v. Superman. Here is my short spoiler-free review:
Believe the hate--this movie is as bad as people are saying. The plot makes absolutely no sense at all. Eisenberg does a hideous job (probably the worst I've seen in any movie in a long time) and the Lex Luthor character (as written) was laughable. In retrospect, it is Eisenberg/Lex that hurt the movie the most. Superman's whole situation is as soulless and "meh" as it was in his last movie, and towards the end the entire movie goes way off the rails and ends up in parody mode.
The one positive is in fact Batman. Batman and Affleck are both pretty good. But it isn't nearly enough to save the movie. Also, even though Batman/Affleck is good...even Batman gets infected with the nonsense plot and ends up making little sense.
Also, I wouldn't say it was like an Avengers flick. The Avengers movies were at least entertaining and internally coherent. This was neither of those things. This was utter garbage.