I enjoyed the movie, it had some of the best aliens I have ever seen. There was nothing predictable about the movie, like some sci-fi thrillers. I was not a fan of Dennis Quaid's acting, but I feel that way about generally everything I see him in. Aside from that factor, I thought it was a great sci-fi movie.
I would have liked to see more of Tannis, but hopefully they are saving that for the sequel (wishful thinking).