I always loved the Mortal Kombat games, althought it'd be hard to pinpoint a favorite. I would say that Deception had the purest MK experience for me. On another note, I also love Marvel vs. Capcom, but it was always baffling to me how there was no dedicated Marvel classic fighting game. That is what actually got me into MUGEN, because I wanted to create a good Marvel fighting experience without anything that would distract from it.