As far as 2-D fighters are concerned I seriously hate my inability to ever find any good cabinets. Although I did play KOF 2000 on the MAME religiously. It's a beautiful game. I was a an avid fan of K' just because I like painfully large high risk combos that really piss people off.
Onto the realm of 3D. I'd have to say Tekken is my outright favorite. I'm a player of Hworang and King exclusively. I like the ability to more or less touch an opponent and open up a chain of combos that just don't end. Plus there is a definite lack of good King players so it gave me something to work towards.
"We are all one." - Genki Sudo