There is quite a big difference between 2H Rages, mace-armed Rages and blades-armed Rages so "Opponent is Rage" is not a panacea.
Yes, it was fairly monotonous prior to the changes of the skill tree, with 10 - Berserk - 10 being ubiquitous for Rages, but at the moment every 100/100 Rage can afford to go Berserk in nearly all cases without too much troubles. You run a berserking speed Rage with barely above 100 endurance placed 9th in Blood Gods.
Still, Rages aren't really a concern as each Rage build is vulnerable to at least two other builds, the point is that in general the game needs a few triggers to make all who have comfortably set a couple of straight-forward "brute force" strategies and forgot about that section to actually implement some creativity in their game. There's too much reliance on simple "hit it until it drops" approaches in the end game.