i played mkg against person only few times but seems all new characters are broken as hell there.
sektor: as hanzo already said the smart missiles traps, no recovery time for the dumb missiles, the teleport can be connected in a combo too since it has 3 or 4 hits limit, terrible
kitana: you can connect fan lift after a juggle, infinite with fan throws... thats all she need actually
baraka: weapon inf, blade spinx2 is 50%+, blade fury inf...
mileena: maxdamage with rolls
kung lao: giant juggles using hat throw, inf weapon, deadly in corner
cyrax: i dont know actually why he is so broken, maybe hanzo can explain ;]