The opening sequence is one of the tensest you're ever likely to see, but the film doesn't maintain the pace thereafter and is probably a bit short of the first, but it's still a pretty effective zombie flick. I could've done without one of the two most overt nods to the genre's gore roots - the eye-gouging scene - though I have to say that the other, in which a helicopter plows through a crowd of zombies with predictably splattery results, had a certain grotesque magnificence.