I have a lot of experience with generic adventure and 'hack & slash' type RPG gaming, but I'm much more interested in nuanced role playing. Especially games with well thought out story and character arcs.
I'm fascinated with Roll20's potential for RPG storytelling; it does most of the things that I dream of doing online.
Other games: Feng Shui RPG, DC Heroes, Middle Earth Rolemaster RPG (MERP). GURPS supplements: Fantasy, WWII, Covert Ops.
Currently playing a D&D 5e game, and a very long running MERP campaign (almost 30 years now!!)