I think the problem with Nolan is that he's clearly a director interested in taking an idea — usually something to do with time, and the plasticity of time, contrary to common-sense appearances — and building a film around it. The more mind-bending the idea, the better, as far as he's concerned.
I think that works in the case of Inception and Interstellar. I was fascinated by both, although I can easily imagine other people having a low tolerance for them. But I recently rented the early one, Memento, and it was slowly driving me round the bend. He can easily box himself into a corner with his idea. So Memento has to keep explaining itself to the viewer as it goes along. Otherwise you wouldn't understand a bloody thing.