Inception is a fantastic film. Aside from the genius craftsmanship, it is impressive and quite exciting what Christopher Nolan has achieved. He's gained enough power and popularity after a string of hits (The Dark Knight, The Prestige, Batman Begins, Insomnia, and Memento) to create a a surrealist thriller and pump it out to mainstream Hollywood.
I've always been turned off by Hollywood blockbusters. Producing 101 teaches you to market films to an audience of males 14 to 30. Why? Because a guy won't sit through a chick flick, but women will go along with their guy friends, boyfriends, and husbands to see the latest Michael Bay catastrophe. All to often, big numbers plague a films artistry and focus on the money: attractive women and explosions.
Inception was a concept of Christopher Nolan's for years, but in order for it to be successful it needed powerhouse backing and faith. Faith from it's producers and crew, and faith from the audience as well. Entering the world of surrealism and dreams requires one to forget our day to day truths and view Inception without our own preconceptions. The attention to detail is superb, as Inception is packed with complex ideas and twists and turns, but the films message and story are solid, and the viewer can keep up.
That being said, having a film exploring the world of dreams, and pulling in big numbers can only lead to more acceptance by studios and the public for smart, surrealist films. It's all very exciting.