Harry Gregson-Williams is definitly not John Williams or Howard Shore. The score for the Chronicles of Narnia is very disappointing. I guess the music itself is ok, just not for this movie. Don't expect any emotional climax like the one in LOTR: The Two Towers where Gandalf finally returns and descends down the mountain. The movie itself was waaaaaaaaaaaaaaay too much Disney.
Speaking about other scores that suck. Harry Potter and the Globet of Fire also sucks big time. I know that it is really hard to top John Williams' previous scores, but at least don't try to reinvent the whole score for Harry Potter. There's no shame in just imitating the "master". At least we get a half-decent score then.