How bad is it? It might be Uwe Böll's second-best film, so... middling.
Should you see it? Nah.
There are a ton of people who are proclaiming Böll as the worst director around and he's not even in the bottom dozen. This film has decent performances by Luke Perry and Lauren Holly. It's a confused narrative arc about a romantic triangle, a post-apocalyptic change in weather, some supernatural horror... and then devolves into a psycho killer film. None of it's very interesting, but it is watchable.