I'd have to say the Mortal Kombat and Tekken series' are my favorite fighting game series. I'm kinda waiting for Tekken 5 to come out on consoles, but Mortal Kombat Deception is the first game I've ever played online. I had to get used to the "Cheesers" for a while and find some anti-cheeses. Hell, I even learned some of the cheesiest tactics, just in case someone wants to get cheesy with me.