Two years later...
and Volibear is still as broken as fuck.
But I don't think that will ever change, so I'll stop complaining about it. On a note that may actually be changed... Riven's mechanics when interacting with the broken bear are messed up right now. Riven's W doesn't proc if he has recently thrown, or activated, his throw. And maybe I didn't play anyone good before but his throw can interrupt Riven's E. (Which maybe should be able to happen when I think about it, but it's not something I've encountered before the last couple of days.)
Anyway, it's hard enough to lane against him when you can stun him and E out but right now you can't so... Ban Voli if you want to play Riven.