Apart from some truly mind-boggling stupid choices in tone, and a few characters, it was great.
That said, It did try to be two different movies. One, a heady, serious sci-fi flick, and two, a dumb monster movie. In an effort to satisfy everyone, it satisfied nobody completely. Hence, why it looks like we're strictly getting a dumb monster movie with the new one.
I'm really hoping the new one plays bait and switch with the trailers and movie, and it does actually end up being related to Prometheus more than it appears to be.