I can pummel christy like no other, but it's ridiculous to pick her and think you're any kind of good at the game if all you're gonna do is press LK/HK the whole time.
edit: also, these characters aren't considered off limits, it's just that you're being a dick if you play them against friends and you knowingly and repeatedly use some of their cheaper moves. For instance, King has a set of low kicks that link together into five hits and if you sink one, you sink all five. Same with his throw. He has a throw combo that takes about 30 seconds to perform, leaving you 3-5 seconds to perform the next button combo for the next throw every time one hits, and it damages out to about 60% if the other player sinks the whole thing. If there were some way of actually
getting out of them, i probably wouldn't complain, but it's easily one of the cheapest moves you can use. Steve has a punch that stuns for 3-4 seconds, giving ample time for a 10-hit combo, plus, he can dodge left/right with the kick buttons, leaving Kuma, Heihachi, and all of the slower players fucked. Almost all of Raven's repertoire are knockdown moves. With Christie, pressing LK, HK LK etc in succession or just mashing the two results in several combos wherein she breakdances on the floor and trips you, even if you're already being tripped. Luckily, this can stopped by
punching her in the back of her fucking head and making her eat shit 
.
Hybrid Mode
