I LOVE fighting games. I've been playing them for as long as I've been gaming. What are your favorite fighters? Do you prefer them deep or do you like accessibility? I like both actually. For me the crown goes to Super Smash Bros. Melee. I clocked more hours in that game (and Smash 64) than all other titles combined. I still play both regularly today. The latter is number 5 on my list though.
For me, my top 5 are the following
1 Smash Bros. Melee
2 Street Fighter 2
3 Capcom vs. SNK 2
4 Mortal Kombat (the most recent one)
5 Smash Bros. 64
Honorable mentions in no specific order are
Tekken 5
Tekken 3
Tekken Tag Tournament
Super Street Fighter 4
Ultimate Marvel vs. Capcom 3
Guilty Gear games up to Guilty Gear XX
Playstation = The Beast from the East
Sony + Nintendo = WIN! PS3 + PSV + PS4 + Wii U + 3DS