Saying that a Warlock is overpowered means little without a consistent baseline for comparison amongst the magicker professions. Consider a 6th rank Sorcerer with the Dishearten spell and an average Magical Attack score of 20. This gives our 6th rank Sorcerer a 50% chance of instantly killing an average 8th rank Assassin, Barbarian or Knight, a 7th rank Warlock or a 6th rank Sorcerer, Mystic or Elementalist. The 7th rank air elemental spell, Garotte (Speed 19), can be similarly fatal to anyone with an Evasion less than 9 (i.e., everyone!). With the average roll on 3d20 being 31.5, it'll be a number of rounds before even a strong character frees himself (which, at 3HP per round, is pretty fatal).

Anyway, my point is that magic in combat can be overwhelming and warlocks are no more 'overpowered' in this regard than any other magicker profession. The best course of action when facing a magicker with MPs remaining is just to run and try to get him to waste his magic on trivial obstacles or take him by surprise with a sufficiently overwhlelming force that he can't get off so much as a single spell.

Remember as well that in DW combat is brutal and deadly (unlike a lot of other RPGs...), so any character entering into a lot of combat is going to die sooner or later, whether it's by having his soul ripped out and his brain set on fire or by having his heart skewered on a Fungus Man's dagger. Better to avoid direct confrontation like that - use magic to learn, avoid, evade and deceive and you'll live a lot, lot longer (now who's saying Mystics are underpowered...!?).

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