I wasn't that worried about the Fifield and whatshisname situation. Bit odd, but oh well. But yes, I do agree that we went from Prometheus's 'Decan' at the end, to the full blown Xenomorph a bit too fast. Also still not sure about David's involvement in it all. I would have loved to see something where David is at first seen by the Engineers as both a threat (humans developed something that was as close to creating a new form of life as a 'god' could) but also intrigued as to how humanity's own creation would want to be a part of it's destruction. Perhaps for no better reason than to proof that him being capable of destroying them was equel to them creating him? An omega to their alfa? A yang to their ying? A desire to proof that he was capable of immense acts, like his creator?