Wow. My favorite RPG's, eh?
Well, let's see.
1. I have to say that the AD&D Planescape game tops my list. It's possibly the best written gaming line I've ever seen. Granted, AD&D is a lousy game system, but Planescape itself makes up for it.
2. Second place probably goes to Mage: the Ascension. Talk about conflict - the struggle to define reality is about as fundamental as it gets.
3. Third place belongs to GURPS: Illuminati University. This game really appeals to my oddball streak. In terms of lighthearted gaming, it's perfect. Where else can a black cat who talks with a Cambridge British accent and is studying to be a professional familiar share a dorm suite with a genetic engineering student from a technologically advanced alternate dimension who happens to be a 5' tall anthropomorphic mouse and a vampire pre-med student? Like few other games, it allows for a party composed of characters as fundamentally divergent as you can think of and still enables everything to work in a smooth, if bizarre manner. It can be silly, dark, simply out there, or some combination, and it all works somehow.
4. Foruth place goes to Little Fears, simply because it's the only RPG I've played in a long time that actually managed to creep out my entire group. The guys at Key20 REALLY managed to put together a game that blends supernatural horror with evil that is entirely too real and deals with a very sensitive subject in a mature manner.
5. Fifth place belongs to Powerkill (
http://www.hogshead.demon.co.uk/NS_Puppetland-Power-Kill.htm). This is the most unique RPG concept I've ever seen. Described as "a meta-RPG of psychological upset," Powerkill is designed to be played after your group finishes a normal RPG. The premise is that the events of your previous session were a delusion that you must now deal with. When you thought you were hacking Orcs in a dungeon with your vorpal sword, you were actually killing teenagers in a mall with a chainsaw.