Not as bad - or as difficult to control - as Gamespot would like you to believe.
The Marine campaign in single-player mode is very nerve-wracking in the first few levels. Skulking around in the dark with a centered flashlight whilst frantically throwing flares around to spot lurking Xenomorphs is great gaming entertainment. I also enjoying the effects of limbs breaking off as I perforated Alien after Alien while performing my objectives. Later on, you are faced with even more pressure as waves of Xenomorphs come at you and you come face-to-face with a Predator.
The Predator campaign was actually my least favorite campaign. The limited jumping capabilities, easy detection by villainous NPCs, and underpowered melee abilities threw me off and stunted my time as a Predator. A lot of individuals are saying, "The Predator doesn't rely on power! It's all stealth!" The Predator actually has both (Apparently not in this game) and that is evident when he kicks Dutch's ass in the first film installment. Now, Dutch (played by Arnold Schwarzenegger) was a huge, overly experienced commando-mercenary hybrid... and the Predator beat his ass and threw him around like a sodding ragdoll. In this game, a female marine was able to block my blows and it took several hits with six inch razors to kill her. That's a little contradicting to me. I went in too optimistic, I suppose. I was hoping to effortlessly dispatch Marines in melee combat. Also, charging up your shoulder gun and firing at a Marine will automatically trigger your detection, even if both Marines are several feet away and have their backs turned. I don't remember Jesse Ventura's character turning around when he had a giant hole blown into his chest.
The Alien campaign was my utter favorite! Watching helpless employees get thrown into my testing room and then tearing them apart felt very empowering. I found that the Aliens melee power and speed are gauged fairly accurately. Killing separated marines seems to make you feel like a Xenomorph and it's as easy as it should be for the darkened, glossy killer. Also, the Gamespot reviewer failed to mention (during what appears to be copying and pasting reviews across the console board) that if you find the manual transitioning difficult, there is a function to turn automatic transitioning on in the control settings. This means that simply running up to your nearest wall or roof to climb it is all it takes to do exactly that. I also noted that some reviews I read complained that applying a facehugger to a civilian was not met with a chestbursting Xenomorph baby. It shouldn't be. Who else saw "Alien" here? The chestburster took hours to emerge after Kane was attacked by a facehugger.
I will also note that Gamespot complained about how killing enemy NPCs was difficult for them. How can it be when several of the functions are automated? For the PC, disabling a Marine/Civilian is as simple as holding down the shift button from a dark roof and then clicking the left mouse button. From there, you press E and then run off. I don't see what's cripplingly difficult there. It is possible that the reviewer was simply not a seasoned gamer and found the controls difficult due to poor skills. The controls are easy to adapt to and an even easier tutorial makes learning those controls ridiculously simple.
I found the multiplayer to be entertaining and it definitely affords you some replay value. The different game modes, such as survival, are suitable for the theme of the game and I think it fits in wonderfully.
I wasn't going into this game expecting this highly dynamic and engrossing storyline. It serves it purpose and fits in well with what the "Alien VS Predator" series is: Murderous, gory, brutal, thrilling and fast-paced Sci-Fi action!