There needs to be a 'minimum' timer, if you spend your game tying up three people at the moment you are still not even renown one (class dependent). just did it (b@stards had to bring me down with a cent ult, and a vort to remove revenge, other two were no longer moving but two kills 4v1 under this system punish you hard... damn PK...go fight one...)
Abilities are far too powerful to be a reward entirely based in a game where eating it is sometimes what you need to do for the team
Said it before but even Call of Duty, the kill streak pioneers, toned their kill streaks waaay back. You dont need rewards for winning, because already winning is the reward for already winning.....