Far as street fighter goes, I am traditionally a shoto player - I like them, and I see nothing wrong with this just because they're popular... I'm certainly not going to listen to the argument of "Be original and use THIS character!". I really don't care if everyone likes this character or that character, I pick the ones I like. In street fighter 4 I'll usually use Akuma, Ryu, Ken, Cammy or Abel.. though in actual fact Ryu and Ken are seeing less and less use, and Cammy is seeing more.
My favourite is definately Akuma, I love his large variety of moves and the real challenge you face with his limited health when you come up against a player who knows how to fight him, especially those who use power characters... try using akuma against a talented geif player and see how you go...
Example: last night I got a mate of mine down to about 5% health - I had not taken one bit of damage. Then he managed to get in close and took me down to about 20% in about 4 seconds. I still managed a win, but if that had been a the start and not the end, things mightn't have worked out.
A note for those who complain about 'cheap tactics' - seriously, find a way around them. Akuma spamming fireballs and teleports? Block the fireballs, wait for the port and land a special just as they end up next to you!
I got similar responses in WoW because I play a Night Elf Rogue, which back in the day was the most popular race/class in the game. I picked the class cause I liked the playstyle and the race.. it had nothing to do with anything else. I still play that class now when rogues are the LEAST played class in the game.