I know it's so easy to label people here "Marvel fans" or "DC fans", but I think that's short sighted. Yeah I freely admit I'm more of a Marvel fan because those are the comics I grew up with. I also grew up with the Superfriends, the Christopher Reeves Superman movies, the Adam West Batman show and Batman '89 came out right after I graduated high school. I have investments in both genres, but admittedly I didn't read a lot of DC comics, I was mostly reading Marvel.
Everyone goes into every film no matter the genre with biases. It's human nature.
I admit, there are some here that just want this movie to fail, and there's nothing you can do about that. I think the vast majority of people being critical of the movie, be they Marvel fans or DC fans simply wanted a better movie.
I loved Batman Begins and the Dark Knight. I wasn't as crazy about TDKR, but if this film would have had half of the enjoyment value of TDKR, I'd be raising the roof. My first reaction to this movie as a person who liked some of the things with MoS, but thought overall it was very problematic, was that it was a much better film than this one. Because there still was an enjoyment factor to it.
In all fairness, if the first half of this film were paced like the 2nd half, I think this film would have gotten a lot more positive reviews, even though there were some problematic parts to the 2nd half as well.
Snyder's biggest problem is that he things he needs to show everything on screen, when it is much more effective to only leave in the important shots, and use exposition and dialogue to convey the rest. Do we really need to see Bruce's parent's get shot again? Because this is a well established character you can use that to your advantage in telling this story. Instead of cutting to an irrelevant scene showing [blackout] kids swimming by the destroyed world engine getting the kryptonite[/blackout] they could have cut that scene out and just have Lex explain where he got it.
You might have enjoyed the movie, but if you don't understand that the movie had pacing and editing issues, then you don't understand how movies are made. There's a reason they have "establishing shots" in films because it give context to the viewer. When you cut right into the Knightmare sequence without an establishing shot that "this is a dream" then you lose your audience.
Sorry but screaming, "this movie was awesome, the critics only like formulaic marvel movies" is a platitude not an argument as to why this film was good.