DPS is the primary measure because many raid bosses have an enrage timer or similar mechanic which essentially makes the fight boil down to a DPS race to beat the timer. It's also a good way to see who is pulling their weight vs the gear they are wearing. There are, of course, some encounters that will favour a particular class due to movement, resistances, etc - but a good raid leader should be aware of this and judge performance accordingly.
Cheers,
S.
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