Agree to scias - best debuff in hands of best damage dealer. Knights need it to do some decent damage and to be a threat. I always thinked of them as tanks, meant to annoy, slow down, keep in place key enemies. They was like this when i started around 2 years ago. They was feared for that.
Barb is an universal killer. It just needs to get near you and it is game over. If knights and barbs need to work together it will be way funnier. Knight to slow down, debuff, protect with auras. Barb to do burst damage in right moment.
Right now this both functions are done only from barbs. Which is erm a little hard for poor mages in RvR.