SPOILERS
I think the main thing that could have been better (other than better writing, which you've already pointed out), would have been having more interesting (or even likable) characters.
As you mentioned, the deaths of the jerk geologist and moron biologist didn't really have any impact. These guys were both supposed to be scientists, but they simply filled the role of so many retarded, throwaway teenage characters from so many 1980s and 1990s slasher flicks (i.e. they simply raised the body count).
Logan Marshall-Green's character was another big douche bag; when David purposely infected him, I was like "Yeah Dave, get his a$$!" (though perhaps that was Holloway's job in the story: being a too-cool-for-all-of-this, pretty boy, hipster-wannabe that the audience WANTS to see killed). At least he was semi-heroic during his first "death" though.
Don't get me wrong, I'm not saying everybody should have been a do-gooder saint or a genius, but with the exception of David, nobody was very likable or interesting (though maybe that was the point; the best individual among this crew of self-absorbed, petty people was the robot servant).
None of the above applies to Charlize Theron though - as long as that Amazon superwoman keeps showing up in science fiction and horror films, she the bee's knees to me. She made that environment suit sing, let me tell ya! Oh yeah, and she's a kick a$$ actress too.
And oddly, after Noomi Rapace's character had the "alien removal surgery" in the auto-doc, she became very interesting and sexy to me. I think it was because the character showed real guts (no pun intended) and determination; she started being real a go-getter after being rendered so vulnerable. Before that, she was just somebodies' whiny girlfriend.
(Yes, in hindsight I'm aware that she was meant to fill the "Ripley role", but at the time I didn't recognize her as the actress who played Lisbeth Salander, and so it crept up on me).
All that being said, I LOVED the film. It was classic Ridley Scott science fiction and the production design was frickin' awesome. I'll certainly buy a copy when it comes out.
BA1: I do not know what you are referring to sir.
BA2: I doubt it. The Avengers was damn good movie.
BA3: We'll see. Maybe.
BA4: Um, probably not. The first three aren't even cold yet (though number 3 wasn't very good).
BA5: Well, I live over here in humid-a$$ Virginia, and it's supposed to be triple digits all this weekend and all next week. I personally don't mind the heat some much, it's feeling like I'm walking around in a giant sauna every time I go outside that I dislike.
Cheers dawg!
"Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn."