I've steered clear of all the major spoilers, because I'll be seeing it on the weekend, but...
Remember when this was meant to be a direct 'Alien' prequel, not directed by Ridley Scott, but by his son-in-law-to-be? I recall people posting up some links to adverts he's directed and they looked fairly impressive. I remember several of us saying that, while a prequel felt unnecessary, we were intrigued to see how it would look.
If you've seen it, would you say it could have been a visual improvement if the other guy had directed it? Or would it have been on a similar level?
This is purely about aesthetics, of course. Not whether the story or characterisation might have been better/worse - no way to know.