Rogue is the class for people who like control. You pick every fight on your terms because you are invisible until you decide otherwise. See a pack you cannot handle? Sneak around it. See a caster you want dead? Sap it, then open on its friend. Bad pull about to wipe you? Vanish and walk away. Nothing else in the game has this much say over when and how a fight happens.
At 60 the Rogue is one of the best melee DPS specs in the game, and a well played Combat Sword or Combat Dagger Rogue lives near the top of the meter. The class is a points and timing puzzle: build combo points with Sinister Strike or Backstab, spend them on Slice and Dice and Eviscerate, manage your energy so you never sit at full and waste regen, and keep your poisons rolling.
In PvP the Rogue is a different animal entirely. Cheap Shot into a full stunlock can kill a clothie before they get a single action off. Add Blind, Gouge, Kidney Shot, and Vanish and you have more control over a one on one fight than any other class. People hate fighting Rogues for a reason.