wk support is ok with the right team setup, but he's a weak laner in the early game, with a low mana pool, he's a walking stun, thats about it.
the vamp aura is nice, his ulti is usefull because obvious and his passives scale well into the late game.
if you're looking for unconventional supports, i prefer sven, his stun is pretty heavy on mana, especially in the early game, but the damage is great and his warcry thing gives decent chase and gang potential, and his ult is good for pushing towers.
the problem is that they both fall off big time if they get behind on levels and giving them space to farm is pretty greedy. they have no counter push and arent ranged, so they cant deward effectively.
they lack the burst and diversity of conventional supports.