An interesting story told four different ways...
Notable Feature: The use of experience points allowed each character to earn two specialized abilities, which differed in usefulness from very little (the Paladin’s Divine Intervention skill never proved itself a particularly worthy replacement for the Quickload button) to extremely handy (with enough practice, the Assassin would make mincemeat out of even the Four Horsemen with her vicious Backstab).
Favorite Weapon: The thin beam of the Crusader’s Lightbringer staff not only burned straight through an entire pack of critters, it also allowed for plenty of fancy bank shots that would make any pool shark proud.
Favorite Enemy: Dealing with a roomful of Fallen Angels was challenging enough to give anyone hives. Not only did they rebound any shot while their wings were closed, the only means of scoring a hit placed the player directly in harm’s way; although (slightly) vulnerable with their wings unfurled, Angels had their own version of the Lightbringer that hurt a lot.
Favorite Level: The Egyptian hub displayed an amazing level of detail (for a Quake-based game in 1997, mind) in its wall textures and statues. That episode’s arid tombs provided an interesting change of pace from the moist dungeons and caves that dominated the Serpent Rider trilogy overall.
Hexen 2 is one of those excellent classics that -- as long as you can get it up and running on a modern PC -- is worth a replay every few years. FPS titles with a fantasy theme seemed to slip beneath games set either far in the future or the 1940s in terms of popularity over the past decade, so the use of mana as ammunition is still a unique and exciting experience.