I saw the film a few weeks ago, and I can definitely see why everyone has problems with it. I will start by saying that BVS is at least an improvement over that god-awful Man of Steel, but I still can't call it a good movie. The film is WAY too long and far too dull for a good 2/3 of the running time. Visually, it's just dour. The script isn't much better, with interesting ideas that are only scratched upon and never go anywhere. I was left pretty confused in areas, and just bored in others. The editing contributed alot to this as the film kept going back and forth from plotline to plotline.
I think the biggest problem with the film is that it didn't give me a reason to care about anything that was happening on the screen. Cavill, once again, was given the bare minimum of material to work with. He ponders. He grimaces. He questions if what he's doing is right, and not much else. Amy Adam's Lois investigates, stays a damsel in distress, and is forced to be the romantic interest. The problem is that her and Cavill aren't allowed to be believable as a couple, and outside of a bathtub scene, all they do is talk about Superman's place in the world. We never get a chance to understand WHY they love each other. We're only TOLD that they do, which is why the engagement ring moment in the film feels so forced.
Luthor isn't completely terrible in the movie, but Eisenberg's performance and the characterization have convinced me that he would've been a much better Riddler than Lex. Eisenberg's shtick was annoying, the writing of his mannerisms didn't help, (seriously, what was up with that Jolly Rancher scene?) and the character's plans either made no sense (Framing Superman by having his men shoot people?) or completely failed (The congress explosion was immediately deduced to have come from the handicapped man's wheelchair). However, I liked the mastermind approach to the character overall. Pulling the strings on so many other characters in the film.
Affleck's Batman, unsurprisingly, was the best thing about the movie. I don't really care about his version killing people (though it was a bit of a shock), and loved his moments with Jeremy Irons' Alfred.
The Justice League tie-ins were pretty bad though, as they were so unnaturally forced into the story.
The clips of other superheroes on Lex's file are such in-your-face set ups for the Justice League movie, that I cant take them seriously. When the film has to actually pause the action for a distracting set up, you know the people working on it have gone the wrong route.
As for Wonder Woman, Gal Gadot is perfectly fine in the role. She wasn't given much to do, and I still honestly can't say that I rate her above being a decent actress, but I don't have any problems with her. I do feel that WW and Doomsday should've have been left out of the movie.
The last third of the film is mindless action that entertains on the most basic level. Since I was given no reason to care about most of the characters in the movie, I just took the fight scenes for the hollow actions that they were, and as it stands, they're decent. The Batman and Superman fight was the brief highlight of the sequences, but only because of the few different strategies from Bruce. I hated Superman's role in the fight, however. Just standing around, taking multiple hits of kryptonite gas to the face. And I thought his strategy was to convince Bruce to help him? Why then, does he push him after the first few traps instead of choosing not to fight and trying to explain the situation while in close proximity?
The Doomsday fight was loud and boring. Merely an excuse to see the three Super's fight together, and of course, Supes' death.
And once again, Superman's death gave me no reason to care, as for two movies we still haven't gotten to really know the guy.
All in all, BvS was bad, but not as terrible as I thought it was gonna be. There were alot of interesting ideas, but they're never expanded upon, and a lack of thought in the details just leave me scratching my head. For example: Why does Bruce Wayne have to call his employees to tell them to leave W.E.? Isn't the appearance of a giant spaceship and the ensuing destruction enough to shake up their common sense?
Why would Luther have his men use assault rifles to kill the African terrorists to frame Superman? Didn't anyone check the bodies?
If Luthor knew that Superman constantly saved Lois and cared for her, why wouldn't he survey her apartment to see if someone's living with her? Specifically, a bespectacled reporter at her job who looks exactly like Superman?
It's a not a very well thought out movie, which is a shame, because there are a lot of good ideas, and they just wound up being wasted.