For a film this long, it should have delivered more

Rating: 5/10 (10 June 2012)

My views echo those of the many reviews already written, so I shan't repeat them all. What puzzled me is that Ridley Scott did want to make a direct sequel to 'Alien' but wanted to make a film as one that 'occured in the same universe' as Alien. Why?
I understand that he was tired of having the Alien creatures in every film that he made within the canon, but if that is the case, why have Scott direct it?
Why bother having an alien spacecraft, inhabitants of said spaceship all looking exactly the same as those in 'Alien' if it is NOT going to be a prequel?
So, we have now seen 'Prometheus' and have felt that we have learned nothing of any real relevance - except for how the icon alien creature came into being as a cross-breed between a tentacled life-form and the humanoid space jockey.
By NOT making it a prequel we still don't know how the space jockey came to be seated in the pilot's seat of the alien spaceship - with his chest exploded, as discovered by the landing crew in the film Alien. Unless, of course the newly created Alien dragged the corpse of the space jockey back to the alien spaceship and plonked him in the seat!
Then, what happened to all the cylinders containing the black goo - so similar to the Black Oil of the X-Files - and the gigantic humanoid head between the destruction of the Prometheus and the arrival of the landing craft from the Nostromo is Alien? Even if they had been thrown around/destroyed by the crash landing of the alien spaceship, debris and unbroken cylinders would have been found strewn around the inside of the ship. However, it can be assumed that the Alien creature that emerged at the end of Prometheus was a Queen that went on to create a nest in the wreck of the alien spaceship and lay its eggs, one of which led to John Hurt's demise as Kane in the original.
With regards to the actual film Prometheus, towards the end the disembodied head of David tells Shaw that they could fly back to the planet from whence the space jockey humanoids had come from in one of THE MANY OTHER SPACESHIPS!!! What other spaceships??
We still don't know the full significance of the planet. Is it sufficiently Earth-like to terraform, given its distance from its own sun - hence the terraforming ability of the alien spaceship in Prometheus and the Earth colonisers in Aliens? But apart from that, what else does the planet offer for two different human/humanoid species to want to colonise it?
I agree with those reviewers who wonder why the space jockey race, given their immense technological abilities, didn't just destroy the planet Earth en mass rather than appear to want to sadistically kill Earth's inhabitants one by one.
All in all, as a film Prometheus offered so much but delivered so little. The initial premise was excellent but then the film ran out of ideas with the sad and resounding feeling that the production/story-writing team behind the film just felt 'Who Cares?'