Just got back from seeing it in IMax.
It was actually pretty great, and way, waaay better than I expected. It didn't mess up the plot of the book in any offensive way and I was surprised at some of the things they kept in there. The acting is probably the best part of the move, especially from the main kid, and Harrison Ford is in full-on Cowboys and Aliens grouchy Harrison Ford mode. I've you've already seen Gravity I'd recommend it.
Anyone else seen it?