Kinda hard to ruin it, but don't read if you haven't seen it- you'll be happier
I'm not going to say too much about the movie in terms of review- it was exactly what I expected in terms of enjoyment. I like everything Nolan has done thus far, so I had pretty high expectations and they were met. I wasn't really blown away by it, but I thought it was very good. I will mention that after watching it, my wife passed over the usual chick flicks as we were looking for a rental the next day saying she wanted a movie "like 'Inception'- something with some 'grit'". We ended up watching "Fight Club"- a movie I never thought she'd want to watch and she enjoyed it a lot. So there you go.
At any rate, the only thing I wanted to ask about Inception was your interpretation of the top falling/not falling at the end. Based on reading stuff on the web and talking with people who've seen the movie, a lot of people interpreted this as "the whole thing could've just been a dream", which I didn't think the movie even hinted at. I figured the question at the end was whether Cobb got out of the last dream or if he ended up stuck, not whether he'd been dreaming the whole time. The only possible hint (other than the whole issue of 'you can't tell the difference between reality and dreams' which will always raise the question of whether anything is real) that Cobb is dreaming the whole time is when Michael Caine tells him to "Come back to reality", which I thought as a thematic reference, not a literal one.
I think trying to ask the viewer to consider if the whole movie was simply a dream would be a pretty gimmicky way to finish the film, way more suited to an action movie like like "Total Recall" that doesn't think too hard and is mostly about blowing stuff up rather than a thinker like "Inception" which tries very hard (and I think succeeds) to set up a working complex rule set around dream experiences. At the end of "Total Recall", if it's all just a dream you can say "Oh, fun!", but at the end of "Inception" you are like "well why did you spend all this time trying to educate me to rules about dreams that might not even matter?" Because if the whole thing was just a dream, then we don't know how many of the "rules" Cobb invented as part of his dream state or. On top of that, the emotional impact of his losses (his wife and children) becomes severely dampened because they might not even be gone- and if they are, how responsible is he really? In the end, the care-meter drops to the floor if this is all some dream state he's stuck in because you can't even gauge what is important if you don't know what's real.
I can contrast that with the question of "did he make it out and has he created a new reality in which he gets to be with his children as a coping mechanism?", which is a pretty powerful and interesting option to leave open in the minds of the viewers (although I want to see it again, because I think there are some pretty strong hints he did in fact make it back to his children and the ending scene is not a dream).
Anyway, as I said, I don't think questioning everything at the end was Nolan's intent, and I'm curious if I'm the only one who felt that way. The first person who mentioned "So do you think it was all a dream?" caught me off guard and I said "Not at all, the only question was whether he got out of the last one". Now I've head enough reactions to see this is a common interpretation, albeit (imo) a lame one. So maybe I'm the one who's incorrect and either a) the "it's all just a dream" isn't as lame as I think or b) I'm too much of a Nolan fan-boy and therefore I overlook when he makes poor story telling decisions.
On another note, I read one reviewer who said the best part of the movie was listening to all the ditzes in the theater after the movie trying to "figure it out". I have to say, it was a LOT of fun eavesdropping in the lobby after the movie while my wife was in the restroom. "It's so, like, you don't KNOW, you know? I mean, did it fall or didn't it?"