Inception.
Generally I am not disappointed by Hollywood films because I expect them to be bad, and the ones I am certain are going to be really bad, I don't bother going to see. But I liked Christopher Nolan's earlier films, particularly
Memento, but
Inception just shows what the Hollywood machine does to decent directors. It's basically just a load of previous plots mashed together as an excuse for 'cool' special FX fights. These are the worst kinds of films. As another example, see
Colin Berry's review article on Elysium. Also
Prometheus.
As for the people saying
The Shining... a film from a great director, Stanley Kubrick, that took a typically flatly written Stephen King novel and turned it into something iconic. Stephen King stories almost always make better movies precisely because he is a workmanlike writer, and his books are all surface - they have so little beyond the words. They are just begging to be made into films. They are the opposite of unfilmable books.