I recommend subbing THF post 60 so you can PentaThrush+Trick Attack(transfer all hate to the person ur facing) so the tank gets all the hate possible without you gaining Aggro.

But no DRGs arent really tanks, /WAR is a basic sub for all Melees(Beserk, Double ATtack, other bonuses), but after lvl 60, two other subs are open and also viable, that being /SAM or /THF. Remember teh sub isnt what dictates who you are, they are there to enhance your main job which is DRG and he does damage.