Here's a few for you...

Project:Overkill (PS1...classic and underrated)

E-SWAT, Shadow Dancer, Cyberball (Genesis)

Jackal, P.O.W., R.C. Pro Am (NES)

TMNT Tournament Fighters (SNES)

A few favorite characters include Ken, Ryu, Cable, Dr. Doom, Sabertooth, Magneto, Akuma, etc.. (so many characters).

Fav. teams : Magneto-Bison-Doom

Magneto-Sabertooth-C. Commando

Doom-Strider-Doom-Iron Man

and Cammy-Sabertooth-Juggernaut.

Classic game :D

Wow...tough one. Here goes (feel free to comment everyone)...

In no order:

SMB 3 (NES)

SF2/CE/HF/S/ST (Arcade)

Pitfall (Atari 2600)

Streets of Rage 1&2

Mega Man 2&3

God of War 1&2

DMC 1&3

Contra (NES)

TMNT (original arcade)

Tecmo Bowl (NES)

I may have listed sequels and other variation to certain titles but with these games..how can u not list them??? Game on guys!!!!!

Well, I never played the GG series but I heard it's pretty good. If SNK is your sweet spot, there's Fatal Fury Battle Archives (FF 1, 2 and 3), and Art of Fighting Anthology. Me personally, here's a few you cannot do without:

Marvel vs. Capcom 2 (if you're lucky to get one)

SF Anniversary Collection (3rd Strike alone is worth it, and you get SSF2T Hyper Edition and the movie as a bonus)

Capcom vs. SNK 2 (great game and characters)

SF Alpha Anthology (all Alphas in one box)

Honorable mention: Midway Arcade Treasures (strictly for MK2 and MK3 alone if nothing else)