I knew that about Batman going in...read The Dark Knight graphic novel when it came out. I just don’t think Nolan is a very good writer and doesn’t film action scenes very well. Inception was very difficult to sit through (especially that endless sub-James Bond ‘assault on the fortress’ sequence at the end).
It’s not about knowing that, it’s about building the story around it. Previous Batman movies at most acknowledge that he’s not terribly sane, but that’s the source of the dramatic tension in the Nolan movies, just like it is in Dark Night and Killing Joke. I like Nolan in general, I like the structure of his movies, they’re abnormal and interesting, I like the fact that he doesn’t over explain, and sometimes doesn’t explain at all, just trusts us to figure it out. I didn’t have any problem with Inception, and I like the way the fortress assault went.