On the plus side, it's a good story, interesting to see how people interact in a world where 99% of the people are gone, and out of the few that are still alive, a good chunk of them are insane and will eat you as soon as they see you. The fact that the infection will change you within 10-20 seconds is pretty rough, and an interesting touch...no drawn out 'oh, god, no' scenes...if you get it, it's over. The happy ending, I kinda expected, but at least it makes some sense, and it's not a complete 'everything's OK' thing. It was also nice to see the survivors acting human, not altruistic. And the main chick was hot.
On the down side, the film was shot in DV, which makes it grainy. That's not TOO bad, though. Some things were a little unbelieveable, and as I said before, others, you saw them coming. I do wish they'd given a touch more background story on exactly what this virus is...you get a little beginning about the fact that these monkeys that are set loose are infected with "rage", but nothing more...I definitely could have enjoyed a touch more about the toxicology of it. It wasn't that exciting...I've heard all these stories about how this movie was scaring the pants off of people, but apart form a couple 'shock the audience' spots, it wasn't scary at all.
I do recommend seeing it...but wait for the rental.