In the end, with how chaotic the combat can be in this game, passive procs work quite well. That being said active abilties and dodges are equally important. I don't think you're thinking this through enough.
They clearly wanted to make a class that has a self sacrifice vibe to it, hence the passives.
Agreed, passive procs only become a bad idea (in competetive PvP) when they are going of by a chance. Everything that goes of by chance can't be used by the player as a direct measure. He can't rely on it because it's not a stable component. This means you rely on luck for a specific part of the outcome of a fight which is a bad thing.
There are games where passive procs that proc by chance are a fun idea such as PvE based hack'n'slays. But for competetive pvp it's just not a good idea. That being said, I don't see proc chances in the revenant's traits while other classes have them.