I've just recently purchased this game cheap, and I can vouch that at least the first Alien encounter seemed pretty tense with the fix applied, although I have not played without to compare. Amazing how this one crept through the QA process. Not sure if the same problem is present in console versions but if so Gearbox owe the community a fix I think.
http://www.denofgeek.com/uk/games/a...iens-colonial-marines-ai-was-broken-by-a-typo
http://www.denofgeek.com/uk/games/a...iens-colonial-marines-ai-was-broken-by-a-typo