I watched this mo-fo in BFI's IMAX in London the other day. Hard to know what was more impressive - the IMAX experience or the movie itself, tough to separate the two. In any way I was thoroughly entertained. Some minor gripes mentioned by others - the ridiculously gravelly Batman voice, the silly ship sequence - but I'll take it. Way better than Batman Begins, which I thought was "OK".
It's got a 12 certificate in England; I think they could have given it a 15, it's so grim and violent. (It's 15 in Sweden.) Of course, parents know best, and so the screening I went to was attended by probably 30-40 kids in the ages 5-10. I would never in a million years take my kids to see that movie. Way to go, mom and dad.