First I'll mention how I'm disappointed that this was not in the 'follow-up' documentary format of the book. With that out of the way, I can actually say it's a watchable flick. I'm not a fan of Brad Pitt, but I like him and his character much better than Tom Cruise in "War of the Worlds." Horror-wise, this is a little lame, and some of the special effects seem merely in the film for having SFx (ie: zombie 'column' breaching the wall around Jerusalem/Israel). One thing that I actually thought made things a little bit realistic was early in the film as Wainio and his family are trying to drive away from the city center. Wainio/Pitt is constantly taking his eyes off the road...which I really hate seeing characters do during a high-speed chase. Bottom line: they crash. I did like references to some aspects of the book. The zombies themselves, much like the book, are secondary to the story. If you're looking for 'jump out of your chair' scares, this is not for you. But, if you just want some decent (PG-13 rated) entertainment, you could do a lot worse.
I consider this a 'cult classic'. It's not quite "Citizen Kane", but it's excellent TV and popcorn fare. A local law enforcement officer is killed in a quite gruesome manner by some unknown creature (ok - not a spoiler, but: it's a crocodile), so the local sheriff calls in the Fish & Game department. Pullman shows up, along with a woman paleontologist, who's run into an office 'triangle' and been deported, so to speak, to check out a tooth found in the victim. Eventually, a well known crocodile expert enters the mix. Along the way, the four make quite a dysfunctional family, with Pullman and Fonda unable to take their platonic relationship to another level, while Platt (playing expert Hector Cyr) and Gleeson (playing the sheriff, Hank) are the two bickering brothers. Finally, to throw another wrench into the works, there's Betty White as Mrs. Bickerman, whose husband is dead (without any records being filed in the local courthouse, and no real explanation immediately coming). Eventually, it's confirmed that there's an enormous crocodile inhabiting the lake. The only question is whether to try and trap it, or destroy it). Pretty light fare, with a few 'shocking' scenes which may be a little bit too intense for very young children. A final note: stick around until the very end and you'll be slightly surprised.