Truly the fully realized AVP experience. With three different campaigns featuring different play styles: the alien (more stealth based), the marine (more horror), and the Predator (a mix of the two), Alien vs Predator 2 is truly a great experience. Playing as the Alien especially is a ton of fun, but all the campaigns are well developed, well paced, and overall a ton of fun. Only problem with the game is the level design and layout makes navigation more trouble than it's worth, but don't let that deter you from a truly under appreciated gem in the rough that is this franchise.
Review of Aliens vs. Predator 2
