I hear 1v1 is important in this game. Get a group, l2cc during immunity instead of the start of a fight.
Anyway, back on topic. Sent/Marauder has a 6s cd on the lockout interrupt, and 12s cd on force leap (which interrupts but doesn't lock out abilities) in dot spec. Merc/commando kinda need the UI casting to help deal with this class since they only have a stun/kb to deal with enemies, as opposed to the speed+3-5 ccs of the sorc, and stun/mez + vanish of the op.