The action is pretty good, but the acting is pretty bad. An ex-boyfriend character of #4's love interest is introduced in an attempt to distract the viewer and attempt to trick us whether #4 is in imminent danger when he really not. The major conflict in the movie is resolved, but unfortunately, is obviously they are setting up for a sequel. (Note: The sequel comes out via book form this August so I'd expect a sequel a year or two from now, which I'll probably rent.)
In the end, the dog was a good addition and I found myself caring more about him than the aliens. I didn't hate the move, but I didn't love it either. I give it 2 out of 5 stars.