Simple. Addon that looks over their gear, scans the talents. Puts in the tooltip what that persons relavant stats/combat ratings are. For example: Tanks, def/hit. DPS, hit. Healers get off free because I can't think of any stat that all healers must have a minimum of to heal well.
Ultimately, it'll probably become another addon that faux elitists use to alienate "the bads."
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