This. Warlocks are bad. Your Rez is a crutch that true skill does not need. It's only ever useful for yourselves, or for the cheese of the month (like Bridge).
Hunters are versatile and require skill to play. And how many times I go invis to save teammates or get a clutch rocket on a boss I can't count.
Hunters = master race
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Invisibility can be considered as a "crutch" as well.