Somewhat good, somewhat bad. I found it boring in parts, as it was the most uneventful book of them all (nothing happens of great importance apart from the prophecy). Perhaps a little too political for my liking, but the ending is good. The things they missed out were pretty trivial in the scheme of things - but I agree that more emphasis should have been put onto the prophecy (the whole 'One cannot live whilst the other one does' deal) because that is something that is very important.
I hate to say it but I sit on the fence with this one. If you're a fan of the series, definately go see it! If you're just tagging with friends or family, maybe not.