Look i have Alein v Predetor and that is a great game.
Aliens: Colonial Marines well to the players that have put it down in the reviews what do you want Aliens coming out of the screen, Every Game will not be perfect.
The game has a story line which follows on from 2nd film but has the licence to go were it wants to go, it mixes it up for the player between fighting other humans as well as Aliens, you dont know who you fighting at any corner which is good it mixies it. The Graphics is good.
i have tried the multi player and yes its differant but you get used to it and when you do you will enjoy it more.
so overall while its not perfect, i will say its entertaining and thats what keeps you playing it. Everyone has differant opinion which is fine.
To anyone thats not so sure to buy it well ask yourself
1. you like shooter games ?
2. Not worried to have Games 100% perfection ?
If it a yes to both then get it, if you looking for a entertaining game, well you wont be disapionted unless your a prefectionest which there is not a game out there that is that good.