for me its Street Fighter series & Soulcalibur series ... for street fighter one time i go to the arcade and scored 500 wins without losing a round against people .... also one time i beat the third in xboxlive leaderboard for SFII but i didnt get the chance to challenge him again .. its only one time and he's really tough opponent.
as for soulcalibur in one place here they make a small tournament just for fun and we play it like this .. ( ho reach 10 wins first he's the winner ) i beat most of them with a result of ( 10 to 0 ) .... also my rank for now in soulcalibur leaderboard for xboxlive in survival mode is ( 28 ) but for characters leaderboard iam the second in ( Cervantes survival leaderboard ) ... for timeattack am not that good in speed cuz my gameplay is slow ( very very slow ) so timeattack mode is not for me.... so over all i need more practice to reach higher position.
now for u which fighting game ur most skilled in and what u did great on it ??? i think most people will say Super Smash Bros 
..... dont be shy and post.
sorry for the bad english.
