I really enjoyed it.
What I thought was cool was that the Inception was, in all accounts, a very simple task. To implant a business strategy.
I really liked that. It was simple and something that I can actually think someone would want to do, rather than some elaborate hoax or something like an assassination attempt or something extravagant like that.
I agree, and I liked the fact that the implication of the story from the previews wasn't what the film was actually about.
What I gathered from the previews was that it was going to be a sort of updated version of "Dreamscape", and follow a more typical summer-movie plot/storyline. As such, my expectations were rather low. I expected a straight-forward, cookie-cutter, X-Y-Z summer movie.
Instead we got a masterfully crafted, complex sequence of events based upon what would be considered a rather simple act; the implantation of a single idea.
I've said it already, but in my opinion this movie was genius.