I actually haven't seen Inception, and even without seeing it the interpretation of the ending I had coming out of the film was that the final scene was possibly, even likely Alfred's dream. I thought it was a brave and bittersweet way to end the film, on an ambiguous note.Yeah, I'm kind of baffled that some people insist on seeing this as an Inception ending.
Not all Nolan movies are ambiguous, and none of his Batman movies are.
I consider myself agnostic on the ending to The Dark Knight Rises. The evidence in both directions is compelling but not convincing.