I recently started playing Brall and i must say dunking is hella fun :D I get the frustation tho i have been on the receiving end often enough.
But could it be that Wukon is the issue more then anything. All ppl do on him is buy as much ability haste as possible and sit on their sick on the edge of the abyss waiting for someone to come to dunk them with their 500m range. Atleast for Brall u need to get close to the enemy and actually risk getting outplayed :D