I played beta and started at launch. Operative and Mercenary were easily the S tier and everything else was MUCH MUCH below that. When they started the nerf bat upon Operative first, they hit it 4x back to back every patch and it just never recovered. That person stating that their Operative does 100k+ dps and such must be talking being 320+ gear rating and going back to fight low level mobs because they're definitely full of S**T! Mercenaries / Sorcs got nerfed next and Mercenaries went to crap from there. I'm not sure if this list is 100%, but I do agree with it as I have way too many toons and maxed out every class and play them all the time. Powertechs use to be S tier, not sure when/what happened to them but they do NOT feel like they use to for me. Fun Fact - at launch - Operatives could kill anyone in about 3-4 seconds by knocking you down and just murdering you. Mercenaries could sit up top of Hutt ball and shoot 2-3 tracer missiles to annihilate any class with ease. Now they both are completely worthless to play next to Marauder / Assassin.