Hmmm...I never used them when I was a Wiz, mostly just because I was Necro/Conj specced, not Enchant at all. But now that I think about it, what I'm remembering is all the times I'd get ticked off because someone charmed something, and we'd be standing around waiting for them to dismiss the charm. Was more of a waste of time than a useful tactic, it seemed. Maybe better solo than in a party.