I found it very disappointing. My review is here
but my main gripe is that it really didn't live up to its potential. I mean it had the opportunity to explore the world and show zombies in different locations, but the climax happens in a small, almost deserted lab in Wales? C'mon, how disappointing. Especially because you can see that sort of thing in any zombie movie, and with more gore.
I did like the first part of the movie, and the swarm on Jerusalem was cool. I also liked the way they 'camouflaged' themselves. I can't remember seeing that method before (and I haven't read the book for years so I can't remember if it's in that or not).