Never played the second one, but I loved the AvP maps of hoardes of aliens coming and just seeing how long you can hold them off! very good fun however long ago that was :freak:
I loved the fact each of the 3 sides were radically different ( and of course the predator side was oh so badass, especially since they got all the noises down ). It was also cool that the aliens could walk on walls and hide above doorways and get instant kills from behind, but the fishcam lens view from aliens was disorienting.