Saw this today and really enjoyed it, not better than the first movie IMO but not worse than it either, they're about on par IMO, but the battle/action scene's in this movie were a lot better than in the first, especially the end when Aslan summons the water God.
The only thing that stopped me from giving this was a SEVERE lack of Aslan, now i havent read the books, so dont know if it is true to them, but Aslan only being in the movie for about 20 minutes AT THE MOST was a big turn off for me, he was the character i was most interested in seeing again so that dissapointed me greatly. Though when he was on screen, he was once again an awesome sight to behold. I suppose it sort of made sense that he wasnt in it much, since even most of the Narnian's believed he would never return, but still, it was dissapointing that he barely even got in the action also. But how the effects for Aslan delayed this movie when he was hardly in it is beyond me.
BUT, it was still very good, the kids were better, Ben Barnes was good as Caspian, and i liked the tension between him and Peter (who also had a little bit of welcome edge to him this time also), and the movie had some very good emotional scene's in it which didnt make the movie flat (though non were as good as Aslan's resurrection in the first movie).
Miraz was no were near as good a bad guy/girl as the White Witch was, and it was nice for her to get a little cameo, but a bad guy/girl of her calibre was SORELY missing, which didnt make the outcome of the battle at the end as satisfying as it was in the first movie.
Overall 8/10, about the same level as the first movie for me. Its a shame a third entry is doubtful at this point.