Just rented it, worth the money to sit down and watch it, if only for the tornado scene.
Acting wasn't great, but it's not bad. It's certainly not good science, but it is good entertainment. Too lazy to write a full review, but if you've got some time, watch it. Nothing you "Must See", and not as good as Independance Day, but hey - It's out on DVD. Rent it.
And yes, I know it was released on the big screen in... April? A while back... But I just now got around to watching it.