Hmm, seems like the most common criticisms are about the overly serious tone and the nonstop, nearly mindnumbing action in the second half.
If you're ok with those two things in your summer movies, then you'll probably enjoy it. Which unfortunately, I usually don't (I usually like my superhero movies to at least be a little
fun, and I tend to zone out during long, frenetic Transformers-style action scenes).
But I've also noticed that a lot of diehard
Superman fans (of which I am one) seem to be loving the hell out of it, so there's always hope...