[quote name='Admiral Ackbar']28 weeks later isn't as good as I thought it would be. In fact, it's not very good at all.[/QUOTE]
I thought it was decent. I don't really remember much about it, but at the time I remember liking it. I enjoyed 28 Days Later more.
EDIT: I didn't really expect it to follow the original story too much. I just considered it a decent movie by horror standards. It's hard to find good horror movies these days. I had high hopes for The Strangers, but that shit was a huge let down.