Wait, let me guess just how cliched this game's plot is going to be. A squad of marines will go onto a ship for no intelligent reason, get stuck, and have to fight their way out. The marines will include 1 guy who swears every M&&^*F*&*ING 10 seconds, 1 token black guy or woman just there to keep people from calling racism/sexism and gets killed 5 minutes in, 1 rookie which will be the player character, at least 1 guy who jokes and screws around and doesn't last much longer than the black guy, 1 tough as nails no nonsense guy that lasts almost to the end and then dies in some convoluted fashion, probably killed by the Alien queen, and 1 guy marine or civilian who exists only to be captured by an Alien and to be infested and killed by their chest burster when they're found a few hours later, and they all end up dead except the player in ways that try to be dramatic but just make most of the squad look like morons and the player must find a way off the ship/planet/wherever before it's destroyed, killing an alien queen on the way out.
I think that what's most important in Alien games is the atmosphere above all, if they can't make a creepy atmosphere that makes you jump at every sound, it's not going to be a good game. Fear is what makes or breaks an Alien game, and it's something that Alien game developers always miss. Gearbox should take notes from Doom 3 on making such an atmosphere in a shooter.