My bro just took me to see it, and I really enjoyed it! It had a good mix of elements: suspense, action, emotion, and it even had a bit of a spiritual/religious side.
My fav funny quotes (you have to have seen the movie to get why these are funny):
"What was I supposed to say, "Want to see some infected rats?"
"Look, if you're planning a suprise party for me our something, just tell me now. Really, I'll act suprised."
And of course, some fav serious quotes:
"God didn't do this Anna. We did."
"What are you doing?"