I have no problem with larger packs. Pick off people on the outside throw and pull from range. Learn what adds you can pull and which you cannot.
Say it’s 1 Elite with 4-5 Small ones, Steath in Blind the elite before you come out of stealth. Sap the next biggest add, or ranged add. Pull the rest away from the first two CC’d ones. Evasion and kill the small ones, focusing on bursting down as many as possible. Vanish to reset big add stacks. Then wait for Evasion, if you are smart you will leave some of the 1-2 packs to the side so that you can kill them while you wait for evasion to come back up. Once you have Evasion go back and Shadowstep+sap the add you Sapped before and kill the Elite, then the add.
If it’s two elites, pull the small ones on the edge and kill. You can nearly always pull a few back from the edge of the group. Then you go in and blind and sap again. This time you either kill the small ones that agro and reset with Vanish, or one of the elites and reset with vanish. Again going and killing the small 1-2 packs while you wait on CDs.
If it’s a bunch of adds fighting each other, go in and bleed up 2-3 of them. They won’t immediately swap to you for direct attacks until you deal significant damage. Once you have rupture on 2-3 of them, burn them and reset(if necessary) with Vanish. Pay attention to who’s fighting who, make sure to try and evenly kill each side until there are less and less adds.
You want to kill everything and loot everything to get as powerful as possible. Some runs you will get stupid powerful anima powers and others you won’t. But if you kill and loot everything you will have plenty of powers to be able to finish virtually every run.
How powerful other classes look is not just a matter of class, it also matters what anima powers they got, which is entirely chance. I had a run where I had 60K+ health and every elite I attacked spawned orbs to heal for 25k, my leech was at 27%, I had a high chance on attack to heal for 10%, my crimson vial was on a 10 second CD, every 10 seconds in combat I gained a stacking 5% damage reduction up to 10 stacks, and Shadowstep gave me 15 seconds of evasion, crimson vial, or cloak of shadows. I was essentially godmode and face tanked the last boss without dropping below 90%.
Sometimes you only have one option for an anima power, but that certainly isn’t the norm. Normally you have 2-3 options. #1 don’t take powers that don’t help you in the last boss fight. #2 don’t take powers that help you kill trivial mobs like Mawrats. Take powers that heal you in combat, take powers that increase your health or defenses in combat. Take AOE powers before you take trivial powers that increase speed or kill trivial targets.
And Rogues aren’t DH and aren’t meant to be. It’s not meant to face tank and pull everything at once. Be smart about it and rogue has plenty of tools for Torghast.
If you want to always roflstomp through Torghast then stick to the early layers until your gear is superb. Otherwise the increasing layers are designed to be more difficult on purpose.
Btw, I am not an elite player. I am completely casual, my guild barely clears normal raids and we finish them well after everyone else does. I know if I can do it anyone can do it, if they just try to use the tools at their disposal and learn from their mistakes.