You don't have to be a boosted 90 to be an idiot about your class!

Reminds me of a IRL friend of mine who, back in Wrath, thought he needed to stack Int gear on his Ret Paladin because it would increase the damage done by his Consecration.
He also gemmed spirit.

I have also been in a group pre-panda, with a paladin that queued as dps, was specced holy and was spamming holy shock.

He legitimately thought holy spec was his dps/caster spec.