Ah, shit. I really don’t like to crap all over other peope’s experiences of a thing, but sometimes I just get so frustrated.
There really is a lot to this movie, but people generally talk about, say, half or a third of what makes this movie interesting (including that philosophy dude somebody linked to, again). At best. Really, though, a lot of people just reference this movie and confuse the concept “Inception” with a “dream within a dream” recursiveness. Thank goodness you fellow 'Dopers are at least beyond that.
The ending is absolutely, objectively, ambiguous. There are, of course, signs and symptoms that point to one thing or another, such that, depending on which signs one pays attention to, one can determine (falsely) for oneself that the ending is definitely one thing or another. But, technically, objectively, it’s ambiguous. It is clear to me that the auteur meant it to be such.
There’s another issue. Nolan did go pretty deep and fairly complicated with the movie. But (and here there are reminiscences of the thread about the author being wrong about his own work), Nolan was not quite as detail-oriented as some of his fans. The top was not Leo’s totem, but sometimes Nolan forgot that fact. For instance.
But, all of that kind of discussion is missing the point, really.
Okay, cards on the table. I once started a thread about this movie that got zero replies. I realize I have weaknesses as a writer, but I really thought that I had hit on something in that movie that other 'Dopers would catch on to, but no one did.
Screw it. What is the name of the movie? What is the theme song of the movie? What is the background music/sound/bwang of the movie? And do you think the top wobbling is the end-all be-all of what the movie means? It’s just a device to get you to wonder about the other stuff. And everybody missed it. I feel bad for Nolan.