Yeah I was rather surprised when I saw Hans Zimmer's name under the music credit at the end of Inception. I just saw Sherlock Holms and I thought that score was quite imginative. So at the end of Inception I was expecting to see a nobody's name in that credit. After some reflection, however, I think the score for Inception is much like the film, a good idea but slopily executed; it's hard to follow, it moves too fast, and it was overstuffed. Entertaining? I guess if you're in your late teens or early 20's.
Most films are like that nowadays. They're like watching commercials. It's just cut and cut and cut and cut. And notice how the camera is just constantly moving, swooping, panning, swishing. I kind of wish somebody would dig up Stanley Kubrick and have him make movies again. I miss that slow methodical pacing and attention to detail that he was famous for. Today, you don't have time to digest anything in a film anymore.
With regards to scoring, I think we've come to a point were the director has maybe 3 choices: A score, a sound design, or a combination of the two.