Okay, I just got back from seeing it, FINALLY. I accidentally went to a babies-allowed showing, but there were only like 3 babies and they behaved for the most part. Bullet dodged! I hate spoiler text, it makes reading these things so hard. Anyway, I think the important thing about the top, and Rachel touched on this, is that it wasn't Cobb's totem, it was Mal's. And not only that, we're never told or shown what Cobb's own totem is - perhaps because if he had one it would quash any discussion about whether the movie was a dream from the beginning, and/or whether just the end was a dream, and all things in between. And although he seems to use the top as a totem (to tell whether he's dreaming), I think the fact that it was originally Mal's and not his casts at least a little suspicion on its accuracy at predicting his own state at any given time. That said, I don't think it was clear either way whether it was a dream or not - and I don't think there is or should be a definitive answer (I like ambiguity sometimes!) - and I think there was enough evidence to argue either way. BUT I don't think that idea that it could have been a dream is an "obvious twist" - even if a twist is predictable, if it doesn't get definitively answered you can't call that a stupid or predictable twist. That doesn't make sense for an ambiguous movie. I also didn't have a problem with the dreams not being very scientifically accurate. I guess I would have been disappointed if I went in hoping for a hard sci-fi kind of psychological thriller, but it seemed to me from the trailers that this was going to be fantasy or handwave-y sci-fi at best, not super sciencey. That said, I'm not 100% sure the mythology/fake science itself was consistent. I probably won't go see it again, but I felt like some things were either badly explained or at least seemed to conflict originally. I agree with Rachel that there was some "Hey this is exposition" dialogue but it didn't bother me either, some movies kind of need that, see: Primer. OH, and I do like the theory about it all being Mal's dream. Also, I love Joseph Gordon-Levitt like candy. I hope he gets the Riddler role.