Well, probably everyone in the blogosphere has commented on the movie except me so... I'll keep it that way and just link to others' reviews. Here's a particularly wonderful piece from Tracey at foolscap:
[...] Sir Ian McKellen certainly deserves an Oscar for saying stuff like "Polygon, Son of Bibbly Bob, Ruler of Nandor, you must go in haste to the Kingdom of Harpsichords" with just the right degree of seriousness.
PS I can't recommend Tracey's site enough, read the 19 Things About Me post. Number 15 had me cackling on the floor and mildly concerning my cat.