I really enjoy playing archetypes "wrong", playing against type. Like melee dominators, scraptrollers, blappers, that sort of thing. I basically only solo so I'm also not burdening anyone with my weirdness. Anyway, that made me wonder what weird builds other people are playing/have played and which were also pretty effective.
I think my most effective was a scrapping fire/kin controller I had back on live. As you can imagine she used fulcrum shift with containment and pp melee powers. Nobody seemed to mind all that much on teams either given everyone gets fulcrum shifted and she ran a bunch of leadership toggles.