I may even be able to get over the actor video clips, but must have some of these callouts, they are just too good and I just can't see voice actors filling in for these. At the very least Ripley and Hudson (Hicks would be great) are absolute musts haves. Hopefully if they can't be added in production, then they can be added later. These quotes would really add to the fun factor immensely.
“We’re on an express elevator to hell, going down!”
“Get away from her, you bitch.”
“I say we take off, nuke the site from orbit. It’s the only way to be sure.”
“MARINES. We are LEAVING.”
“That’s inside the room.”
“Oh, great. Wonderful. SHIT!”
"Game over man game over!"
"Think of what? We're f**ked!"
EDIT - Another good one from Vasquez "Lets Rock!!" At the start of a multiball.