As most reviews have said, the reason to see this movie is the 3D experience. The beauty of current 3D technology is not that things jump out at you but that it adds incredible depth to the picture. The scenery in the movie is beautiful, and I think the 3D is worth the extra expense of the ticket. But yes, the story is nothing special (which is why I give it 4 instead of 5 stars). Pretty generic stuff that's been told many times before, though the setting in this case is creative. And it's not a terrible narrative that you just don't care about. You can get drawn in if you let yourself and don't sit there criticizing it for being unoriginal. And if you pay to go see it, why would you want to ruin it for yourself like that? Go and enjoy it.
Worthy sequel to the excellent first film "Batman Begins". Just as good, possibly better, though definitely darker. Heath Ledger gives an amazing performance as The Joker. Most of the reviews have been very positive for this movie and they were right. If you like Batman, you'll want to see this one without a doubt.