I have a 50 juggernaut with mixed matched champ and T2 gear(mainly T2). I've found that our abilities just don't generate as much aggro as they should. I have 34 points in immortal and the rest in the second slot just so i could get the bump in strength. I've finished all the hardmodes a few times and raided a couple as well. With that being said i always put "guard" on the assassin in the group they're class seems to do pretty good dps but always generates a high amount of threat. On bosses I would rotate in with ----enrage, forcecharge, backhand, viscous slash, sundering assault and viscous slash. This rotation gets my threat up fast then ill keep going with my same technique popping enrage all the time when its cooled down. Ill taunt with my singular taunt the first time it peels and area the next. The cooldown on the single taunt is 15 seconds, so if your using your guard technique and popping enrage everytime its up then holding aggro is no sweat. I actually call out dps now for not burning down adds fast enough. A good tank can hold two mobs threat lvls at all times by ccing and area/single taunts. Any more mobs then that the dps should be burning them down fast and then helping you out. Its hard and yes i would like our abilities to generate more threat but when your geared up and running the hardmodes daily it'll come to ya. Hope this helps. Remember enrage on bosses is your best friend and always guard the assassin if you have one in a group. Thanks guys, later