Yeah, saw it yesterday. I think at the start of it, it was hard to get in to simply because I was looking for all the rules and strings and so forth. I'm glad that there was no big twists during the main plotting - I spent alot of the film not quite comfortable in the world, scared he was going to shamalan it up. Instead, the central arc of the story was left nicely alone. I wish I'd known that, I think I would have settled back to enjoy the film more knowing that there wasn't going to be a big reveal. Instead [spoiler]you get a pleasantly ambiguous ending to try to workout at the very end instead, after the action has died down.[/spoiler]
As to the ending:
[spoiler]It seems to me there is a few ways it could be interpretted:
a) The entire film was always in his subconscious. Saigo was actually attempting to rescue him (or could even just be a projection too). If the series of kicks had worked, there might have been another bringing him really back to the real world. The fact his wife and Saigo both mention leaps of faith (Saigo twice) makes me think everything is Cobb's projection.
b) Once Saigo 'died' and was lost in his the lower levels, and Cobb missed the kick, there was no way back. All Cobb could do was 'rescue' Saigo by reminding him of the mission, and the fact it succeeded. In that way, both are able to then move on and enjoy their subconsciouses in a positive mindset. Though both have still, basically, died (I assume in some form of coma) in the real world.
c) Oh, I dunno, there are probably many![/spoiler]
I also like some of the smaller things. Like Cobb is probably lying when he say more positive emotions 'take', and it is simply if he's going to destroy a person with an idea, he wants to leave something positive behind that will let that person rebuild their life. And so it lets the resolution for Finley seem like a good one, when in reality they have just done something horrible to him for profit. Except, as we see, his father was probably horrible to him. Or perhaps not, and the reality they fashioned was actually what was there, which is why it worked out.
Definitely a film to see again, just to see if the there are some more clues for tyhe very end, and more importantly just to enjoy the film now I know the rug isn't pulled out from under during the film itself!