No flares in MP or Survivor
Disc spamming is a HUGE issue
Survivor maps are to small
Lack of weapon selection for the Marine
Flares aren't always red when tossed (see colony level, they light orange in certain spots)
Repetitive lines from the AI
Game freezes from time to time, even on my XBOX360
Most maps feel stale (I like Refinery and Pyramids though and they need to add some sort of old school LV-426 map or something)
When people leave a game cause they are getting owned, you get no experience or a win (total BS)
They fix some of that, I would be happy.