Spectacular and entertaining but...

Rating: 5/10 (30 May 2012)

...beware. If you enjoyed "Alien" and "Aliens" and have very high expectations as I did, you will be disappointed. Not by the visuals, extremely good, and the acting, good IMO, but by the script. In a way, I feel I fell in a marketing trap.
This film was marketed as an Alien film, in this way : "A separate story that precedes the story of Alien but is not directly connected to that franchise."
Not directly connects ? The Weyland corp. is there. The ship the crew of the Nostromo finds in "Alien" is there. The "space jockey" is there. The usual robot passenger is there. And finally, the Alien monster is there. With the story of Prometheus, I don't see those elements interesting to use, besides an easy marketing.
The script hadn't me asking questions about the story, but rather about its cohesion.
One example - Weyland and his daughter come on the planet to get answers about humanity, and eventually find eternal life, and have created the robot (David) to work for them. Yet when Weyland dies and says "There was nothing", the robot says "I know".
Another example, arrived on the planet, David seems to know what the Aliens are, and wants to bring one back on Earth. If in "Alien" the robot was on a secret mission for Weyland corp. to bring one back as a biological weapon, here it is the same, excepted that it obviously wouldn't be the Weyland corp behind it. Besides others humans sending David for this mission, it could be the "Engineers" themselves, or Aliens, or of course, even something else ? Which would for me make lame "explanations".
Of course these plot "holes" are most likely "secrets" that will be answered in the next installment, because there will be one : it's unfortunately the law of marketing. Anyway, I won't be in the theater to hear them.