What are you on about man..
Guy I quoted is right. Op, you have no clue. A Sorceror is not the same as an Assassin, much like how a Powertech isn't the same as a Mercenary. Those are the CLASSES, they define the players gameplay to go into a pack of Gold mobs and not be 1 shot by 1 of them and instead take a beating by 4 while their counterpart (I wouldn't even go that far to even call the other class a counterpart) hangs back and brings the heals.
You could have made sense with your post if you actually defined what Juggernauts and Marauders had in common (ie Vicious Slash, Charge, Smash) instead of confusingly stating GBTF and such.