Back before BC, my guild <Retribution> had a good way of dealing with multi-mob pulls in Naxx. I think we only had like 3/4 warriors that we brought to raids, so for any pulls with more mobs, we used to have all the mages do a "retri" pull. In other words, they'd all Pyro/PoM/Pyro the same target and burn before it even got back to the group, hopefully killing it. When it didn't die, well, then we had some dead mages and healers to rez after the pull.
But again, I think it's a viable strategy, one person unloading on the mob/ a boss before it gets to the group, if and only if you're hit capped, post 2.3, so that the taunt it guaranteed to go off.
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