I wouldnt mind having that facehugger dangling from my ceiling.

(or build somekind of spring system to it and mail it to Hunter so it jumps at his face when he opens the box

)
They've definitely played the other games as I'm quite sure that the Hive map you get with the pack is ripped from AvP, where it was an extra level called Refinery, based on the Fiorina 161 from Alien 3. Also, the outpost sounds and looks like it's been taken from AvP2.