I actually did not know that Prometheus is part of the Alien franchise. If I did, I would have given it a miss as such films are simply not my cup of tea. That said, the final product was reasonably entertaining. However, as with most of these horror-thriller movies, the script is marked with random bouts of unrealistic idiocy to get the plot moving, something that I really can't bear for any length of time.
I suspect that this will be a fun film to watch in 3D.