Just check out this review into four section. In fact celebrate, because we have three very different campaigns for each race in single player and multiplayer. Read into that assessment ...

Marine
Hard: A nice schietfestijntje with a funny story that borders on terror and a few small moments thanks to the freaky aliens.
Soft: Standard horrible weapons (except the smartgun, which fans of the Aliens movie will recognize it) and the graphics are not exactly fantastic (which of course applies to the entire game).
Huh?: Why the **** suddenly shoot some aliens with acid blobjes!? So much for loyalty to the franchise ...
Rating: 67 Aliens vs Predator

Alien
Aliens vs Predator Hard: The Xenomorph play completely different than the other two races. They can walk on walls and ceilings and although it often works quite disorienting, there is nothing wrong with the steering.
Soft: This is by far the most boring campaign. There is almost no story, you just follow the orders of the Queen, who range from "find the exit," "make the dead Marines' to 'go there'. Only the beginning and end are pretty cool movie.
Huh?: If you people can alien being 'harvesting'. You push them to their face in a facehugger (freaky spider-like creatures with long tails that eggs in people's breasts, through the throat after a mini-alien burst out), but the only sure reward you get is a " higher level score. LAME!
Rating: 55

Predator
Hard Aliens vs Predator: The Predator is everything, stealth (kills), pops in his shoulder-mounted gun, he mines, melee weapons and even a sight which he both humans and, later in the game, aliens can spot them. He can jump like a kangaroo once on speed.
Soft: The navies that you're going to stalk and kill one by one are not really scared. Furthermore, you really discover what those guys are ****ing retarded, because after four seconds, they have forgotten that a monster is to make their comrades. In Batman: AA, we have seen a thousand times better.
Huh?: The spines plus heads of your victims pick you out as easily as a daisy from the ground. Also strange is that at the end of a campaign spear-like stick is that you can throw enemies into one off. This pretty much makes all your weapons obsolete and even the very boss is a cinch with this thing.
Rating: 76

Multiplayer
Hard: Surprisingly good balance between the races and a few good modes, especially Predator Hunt Infestation and its great.
Soft: Probably the usual Deathmatch hardly played since by far the least fat. Also, the looks and layout of many maps a bit crappy.
Huh?: Why is Survivor (a kind of Horde / Fire Fight, "waves defeat enemies' mode) in Giger's name split playable? Graphics such as these easily in half or even quartered be ... but apparently not if you're Rebellion.
Rating: 82

Conclusion
The ASF has a single player from excessive "follow in the way religious mission marker' content to really exciting, interesting or challenging to be. In addition, the story less interesting than an episode of the Palingsoap, the graphics are not as ugly as I can and Predator / Alien Quadrilogy fan not really say that it is compulsory reading. The multiplayer is pretty good and what is quite fun, especially for those with more sci-fi and aliens than with Modern Warfare, bad company or Massive Action have.