Yes, it really is that good. And very much from the writer/director of Memento and the Prestige.
UPDATE: I want to say one more thing in advance of me writing something longer about the movie. This is Nolan is puzzle-box mode. The easy, surface explanations for what happens (or what you think happens) are never the right ones. And Nolan always gives you the answer at the end.
If that's not enough, I'll give you one more clue. The target of the titular inception is not Robert Fischer.