hunters could be OP but not as OP as a warlock no matter how u put it, eg. hunters have quick dps and a nice mana drain but if u think of it locks have the guts (moves) to beat every class.

like:
healers: curse of tongues and drain mana
caster dps: curse of tongues(unless its a lock) and dps away with felhunter spell lock.
melee dps: curse of exaustion and fear.
other locks: DOt DoT DoT siphon life  spell lock, fear and in very sticky situations death coil.

and thats what makes warlocks OP although i truly respect hunters they are about the same OPness as a lock

pls tell me if im wrong =)