Saw it a couple of weeks ago and it left me unmoved, and more to the point impressed at the budget and stunning FX and depressed to see them wasted on such pretentious twaddle (just like Avatar). Read a few reviews since. Guardian, Kermode.
Yes, lots of unresolved uncertainty, dreams within dreams leaving disjoints in time and in between dream and reality. Clearly not meant to be easy to follow, getting lost is deliberate – OK, no problem with films that take several close viewings to get the whole story – Fight Club say. But why the mix of drivel script – as if we needed a running commentary of what was going on – with the zap-pow action-movie for what is obviously a psychological plot. The recurring wife and kids guilt trip just deepened the tendency to gag on the formulaic hollywood elements.