The lights are on
These critics are rating it low because of glitches and bugs (every game has those on the day it comes out and it gets an update just as Aliens Colonial Marines did)
ALSO, may I point out that they are trying to say that it is nowhere near worthy of being a sequel to Aliens, the 1986 Movie that is still thought of as one of the greatest movies of all time. It is going to be difficult to make a game that is worthy of being a sequel to it, what they gave us was a good game that I enjoy without end, I would give it at least a 7.8, and at most a 8.5
It is not perfect, but it is still a great game, they expected way too much form this game.