Juggernauts dont have to rely on defense as much because heavy armor alone already has enough defense. Shield Rating > Absorption Rating > Accuracy > Power > Surge Thats how I prioritize my mods on my gear.

I haven't experienced any problems with it. I use it on CD as much as I can. Maybe you should try putting a point into Force Grip. You can choke a target on one side of the room building threat, force leap to another target, hit it with sundering assault, hit tab to taunt and force scream the third target. Backpedal to bunch up the mob and then have the dps use aoe ontop of you while you use Sweeping Slash.

http://www.torhead.com/skill-calc#101GRGkudMdczZcGb.1

Physical Damage which are displayed as white text after hitting a target.

Defense is the less likely stat you want to use because we have the highest armor def in the game since we use heavy armor. I've been going Shield Rating > Absorb > Defense in my stats and it works just fine. http://blackrabbit2999.blogspot.com/2011/12/swtor-immortal-defense-tanking-guide.html ^ that should help

Haha ok first of all if you're going to tank you need to have points in immortal no questions ask just do it. This is the build I use and it works fine: http://www.torhead.com/skill-calc#101frG0ubrkuoZhGb.1 You want to start off by building rage before you force charge into a group. So use saber throw then force jump in this giving you 6 rage to use. Sundering Assault and Crushing Blow are your main threat generation abilities next to Backhand. If you have over 100% accuracy this will help threat as well cause you're lowering defense. It is not necessary though but you will need a minimum of 96%. Keep your force scream shield on CD the same with your Retaliation dmg reduction on CD as well. Same with smash cause that lowers accuracy generating more threat mainly used on a group of mobs and the boss. Other than that use taunt on units that stray away and threatening scream on a big group to keep your threat up. A good way to practice is by going into an area that's a little higher level then you and just whacking it to find a priority rotation either until you beat it or run away until it stops attacking and goes back to where it was.

I found that build to be a little intriguing as well and might try it out. Please post back on here to see how it goes for you.

You want to always have Endurance and Strength on all the mods you can put in your armor. Then after that it should go Shield Rating > Shield Absorb > Accuracy > Surge > Defense Rating. Crit is useless for us Juggs.

I find myself having no issues trying to hold threat from my party. I just tag a few with sundering assault and then just mainly focus on the strong or elite NPC. If I see weak NPC's not focusing fire on me I just either taunt or AOE taunt to get them back on my and tag them again. You have to keep yourself on your toes and look around to see whats going on and move accordingly. Here is my current build: http://www.torhead.com/skill-calc#101frG0ubrkuoZhGb.1 Stats if I remember correctly are: Defense Rating: 6920 Defense Chance: 22% Damage Reduction: 45% Shield Rating: 39% Shield Absorb: 36% Accuracy helps generate threat alot for if your over 100% you're lowering the NPC's defense. But it only really needs to be at 96% minimum. Sundering Assault and Crushing Blow are your main attacks for threat generation so using those as much as possible helps I've noticed as well. Other than that your party dps should be killing the weak NPC's first before they help you on the strong or elite ones. They shouldn't be pulling threat off you if they are killing what needs to be killed correctly.