I thought Inception had the potential to be much more interesting than it was. Much has been made of its depth and complexity but (perhaps because it is after all a big budget Hollywood film) I seldom found myself working very hard to understand what was going on or why. None of the action sequences were at all engaging (at least for me) because there was no sense of reality and therefore of risk. Mind you I thought the scenes in the hotel corridor (which were not CGI as you may have already heard) were visually striking. I would recommend that if you are interested you go see Memento instead if you haven’t already.
Still, if it is successful and that success encourages mainstream Hollywood to be more ambitious in its storytelling that would be a good result.