It's an average FPS with Aliens. Ever play Singularity or Homefront? It's like that. A decent FPS that has some nice moments and ambience. Personally, I'm enjoying the game because I feel like I'm in the Aliens universe. Graphics, controls, sound, gameplay, and AI are no better and no worse than any other average FPS out there. Some people just got their hopes up too high.
It's a fun game and nods to the source material in the right way, IMO. Maybe they expected "Aliens: Borderlands the Movie" or something.
No, it's terrible, and it's clear Gearbox was up to a lot of underhanded things stringing Sega along for so many years. Let's be clear here, this is not a case of nerds hating something popular ala COD. This thing is a travesty, and in any just Universe Sega would be allowed to publicly be-head Pitchford.