Some highlights from various reviews:
An even less charitable way to put it is that a clearly excited 7- or 8-year-old kid sitting in front of me busted out crying and had to be whisked out of the theater by his father within the first five minutes....I felt really terrible for that kid immediately, and was mildly envious of him two hours and 25 minutes later.
As my 8 year old wants to see this, I wonder what made this one cry.
I think DC just has gone way too grim and dark with their universe. I have to wonder if Justice League will be the uplifting one where the superheros come together to save the world. I have much more interest in Civil War than this movie, especially after Man of Steel. This has an interesting concept of Batman wondering if Superman is a hero or a potential destroyer, but I feel we have seen the entire movie in trailers. I also don't like the direction they are going. Everyone has wanted to see Batman vs. Superman, but now you introduce the oldest Batman to date, with an unknown fate for Robin. At this point, I would almost prefer a live action version of the old Challenge of the Super Friends with the Legion of Doom.