I think the failure of this film to be superb, rather than a 7.5/10 film is based more on the characters and dialogue. Unless there are many alternative takes then I don't know if the Blu ray can fix this. Some of my ideas:
Warning: Spoiler! (Click to show)
The 2 geologists' behaviour and dialogue completely changed - from the start - "I'm a tough character I only carry about money" stuff, to the very stupid scene of trying to stroke a serpent of doom.
Holloway - his taking off of his helment was asanine, as was the rest of the crew following suit. That whole scene inside needs re shooting so a scan was done to determine no bacteria/ viruses before that was done. He also had very clunky dialogue
Vickers - do we really need a scene of a woman doing press ups straight from cryo to show she's serious? It was trite even for the Aliens die hards and the Vasquez nod
The Captain - almost all of his behaviour up to the point of him taking the threat seriously was bad writing. He's the captain of a $ trillion mission, he would take things seriously. The sleeping with Vickers scene was also out of the blue and poor.
If these and a few other shots were re done + a little more character insight on David it would be an excellent film