Zack Snyder films are highly divisive. Some really love it, some hate it. Imo if someone wants to see it they should see it. People shouldn't let Rotten Tomatoes influence what they want to see. And if you think you don't want to waste $ or time then don't.
I don't know, but the trailers look awful. With that said, I'm still probably going to see it eventually because I love films based off of comic books.
Because the sequencing is so bad during the first half, the transitions between one scene to the other are not organic. The plethora of un-needed slow motions scenes is awful, the big loud music every time Batman is standing on top of a building or when his armor appears is ridiculous. The battle between Superman and Batman (which is the title of the movie hence should be the essence of it) is one of the most underwhelming part of the movie. The "plot" is hardly a plot. Batman acts out of character of what Batman is.
But...Ben Affleck endorses his role very well, he screams Batman (not as much as Bale but who could really?), he was just poorly written. Wonder Woman is fantastic (people should at least watch it for her) and Superman's history is a bit compelling even if Henry is a little dull.