I saw it. I thought it was "fair". I'd rate it about a 4 out of 10... maybe a 5.
It was nothing at all like I was expecting. The aliens were Halo clones. My biggest problem with it was that you sort of know exactly whats going to happen about 20 minutes into the movie, then you sort of just wait for it to play out.
Parts were cool. I thought some of them major plot points happened really quickly and then were just over.