There are lots of things you can pick on in this movie to be sure but there are also lots of moments that if you like the campy-ness of the thing are quite amusing. Its a pretty ambitious thing to try to make a sci-fi horror on what looks to be a zero budget and I commend them for that.
Thor is always fun to watch, if you've ever seen him in concert you know what I mean. Anyway its worth a rent for sure I think if you are in the right mood. Its not Oscar material obviously but I've seen less entertaining movies. I have heard that it was actually 2 separate movies that were turned into a single film and after you look at it that way you can kind of see that in it. Tricky work to pull it all into one story. I could see this thing have endless sequels within the characters that it creates.