If you were burned or disappointed by Aliens: Colonial Marines, then I'd highly suggest picking up a copy of this game. Aliens vs Predator is a solid, polished shooter reminiscent of the original game from 1999, and is guaranteed to thrill and surprise you.
The player experiences three different campaigns; predator, alien and marine. Each campaign has a different playing style, and I'm very impressed by the way Rebellion has managed to polish each style so efficiently.
Firstly, the marine campaign. Probably the best of the three, you use classic weapons from the Alien films and comic books such as the pulse rifle, smartgun and double barrelled shotgun. The shooting is surprisingly tight, and you'll get into a nice rhythm of blasting and reloading. The darker levels are great at creating suspense, and the xenomorph models are beautifully animated. They take you by surprise and can swarm you very quickly, which creates moments of panic that I haven't felt in a shooter for a long, long time. You also fight other enemies like Weyland Yutani androids, who are unsettling in their own way (probably those creepy voice recordings and expressionless faces). You can also experience classic movie moments like blasting the Alien Queen out of her egg sac, which is awesome to just about anyone who has seen Aliens.
Secondly, the predator campaign. As the Predator, you'll attempt to stay stealthy and pick off enemies using the range of tools at your disposal. You have a plasma caster, a spear, throwing discs and of course, the classic wrist blades. Much like the Batman: Arkham games, you'll navigate high vantage points and isolate enemies with x-ray vision until you are able to safely dispatch them. However, the game will also make you fight Aliens in close combat, which is frustrating and clunky; this consists of repeatedly mashing buttons while aliens continuously leap at you, which makes for a frustrating experience. Also, while the execution animations are quite awesome, they also take a long time to complete and make you vulnerable to damage, which is extremely annoying on harder difficulties.
Finally, the alien campaign. Playing as the alien also focuses on stealth, and you'll climb over different surfaces while attacking with your claws, teeth and tail. The wall climbing mechanics mostly work, though they can be confusing and hard to use at times. The constant movement of the alien is also quite dizzying, and is especially noticeable when traversing the inside of buildings. Whilst this campaign is still fun in its own right, the confusing wall-climbing and lack of interesting attacks means that this campaign is the least interesting of the three.
The game looks fantastic visually, but all three campaigns take place in the same location, so it can get quite repetitive due to the re-used locations. Despite this, it is fun to see where the other species has gone after completing each campaign. For example, when playing as the Predator, there is a level where you find the dead Alien Queen after the Marine segment where you kill the Queen yourself.
Overall, Aliens vs Predator is an awesome game that doesn't disappoint. The three entertaining campaigns are immensely satisfying, despite odd design choices and irritating game mechanics.