Trot your warlock into the level 28 real quick as a Sunsinger with no void weapons. See how optional it is, because your other option is to be carried.
To understand what you are responding to. The (hypothetical? Not so hypothetical...) Player I am referring to is running an off-element weapon while under-leveled.
So the only problem is the fact that underleveled players are getting matchmade through. Not if he has his purple thingy when the swirly icon says feed me.