I'm only luke warm about Narnia as a whole. It's not as exciting as Harry Potter, and nowhere near as magical as Lord of the Rings. It's... childish, for lack of a better term, I suppose.
I like the movie a lot, though. I honestly expected to really hate the kids, but they were nowhere near annoying, especially compared to what's-her-name screaming bitch of a kid that I really want to shoot dead in War of the Worlds (I was rooting for the aliens to kill the damn girl.) Narnia's battle scene was really awesome. I didn't expect fauns to look that badass, but they are pretty badass in armor. The centaurs were very cool too.
The one thing I never gathered from the books was what time frame the kids are supposed to come from. The ending of the series was also anticlimatic and really pissed me off.