I played about 3 hours of the Single Player campaign, and I have to say that the game is not really all that terrible.
-The AI is really aggressive at least on the Hard difficulty (playing on PC), so I died quite a few times. Maybe on Normal it's too casual, but it gave me a decent challenge so far.
-Atmosphere and graphics are ok for me, but I understand the complaints after watching this
-Sound design and music are actally pretty great and shooting feels responsive (at least with the Pulse Rifle, which I used almost exclusively)
Honestly, I don't understand how this game is worse than the latest Medal of Honor. Even story-wise, I would say they're on par on the "meh" scale. I like the Aliens movies, but I'm not a huge fanatic or anything, and I am enjoying this game as a slightly above average FPS.
Now, if you'll excuse me, "I'll pour some Whiskey, sit on my couch" on this cold Miami day, and play some more ACM