Okay, I saw it last night (unexpectedly). I'm not going to post some long review because I haven't thought it through enough yet so I'll just make a couple points.
This movie is the epitome of "it was GREAT in some ways and AWFUL in others". There were parts that were just so epic and awesome (in the true sense of the word) but there were also parts that took me right out of it.
First of all, like many people, I loved Ben Affleck's Batman! Batman was a plus in this movie for sure. Loved Affleck's performance, I loved how the character was written and portrayed, I love the costume. I loved it enough that I could get over the killing parts. I realize this is a fundamental part of Batman, but for some reason I was able to look past it. Hopefully this issue gets ironed out in the Batman solo movie and any other future movies he appears in so it's as if we can look back at this movie as a specific time in Batman's life when he was unhinged due to his blinding hatred of Superman and anger in general. They could be isolated incidents of killing that truly aren't normal for Batman. I don't know...
I know some people aren't a fan, but I also enjoyed Eisenberg's Lex Luthor! I don't know if it's true to the comics - I never really read or watched Superman growing up - but I thought it really worked here. The guy is a true maniac almost right off the bat and if you're not a powerful super villain, then you have to be super crazy (aka Joker) to take you seriously as a villain. I look forward to his future appearances in he DCEU! Also, loved the Batman/Luthor confrontation at the end.
The Batman v Superman duel was truly epic! Not only was the physical fighting great but you could feel the tension. You could just feel Batman's hatred throughout. Snyder, the actors, writers, everyone involved with this scene: they got this part right. It wasn't just about what I was SEEING but what I was FEELING throughout it.
A few things I did NOT like:
Hated the fight sequence in Batman's dream. Did anyone else? It looked absolutely awful to me and took me right out of the scene. Looked like half the fight was CGI work. I pictured Ben in a studio just doing random moves and punches to nobody in front of a green screen. Awful.
I know some fans are trying to justify it, but there is no way you can justify how the BvS fight ended and they suddenly teamed up, the whole Martha thing. I couldn't believe what I was seeing. Such, such amateur writing to me. Wow. Like, that's their plot device?? It wasn't just that the name Martha stopped Batman from killing Superman, it's that suddenly he helps him up, pats him on the chest and says "don't worry, your mom isn't dying tonight". So, so cheesy.
There are lots of other aspects I both love and hate but I'll discuss them later. In a nutshell, I find that this movie has a wealth of great scenes and sequences. The overall problem is that these bits of fantastic material are all connected with very bad editing, plot devices and writing.
I also feel that the answer to a lot of arguments in the past several pages of this thread can be summed up in one thought of mine: this movie was made too early. For instance, the Flash vision/dream sequence. I thought it was the Flash at the time but wasn't sure, and I was spending so much time figuring out if it was him that I wasn't listening to what he was saying. In turn, I hated the scene at the end where Bruce tells Diana they have to find the other metahumans and stand together. That scene seemed so corny to me (it since makes sense now that I understand the whole point of that scene is he was urged to do so by the Flash earlier in the movie). The point being, I don't think the GA needed all this yet. I wasn't necessarily "looking" for these Easter eggs because I was too busy just trying to get a feel for Batman and Superman at this point. I don't know if that makes sense...
I guess this kind of ended up being a review so...here's my rating: 6.5/10 for me.