In my opinion its not an exploit and a good strategy. I think SE will end up fixing the rage mode because its not how they want the fight to work but I almost wish they wouldn't because it allows people to bring two melee DPS instead of the one for LB. Finding a PUG coil group as a melee can sometimes suck. If anything though its SE's fault for making an easy rage mode, not anyones for doing the easiest method.