For me it has to be Rogue. Probably Dwarf or Barbarian. I like the idea of Dwarf most because they have a comparable starting STR to Barbarian, and they don't have an illusion. Plus BARREL ROLL!
I like the tools they have and I like the fact that they aren't called upon to do anything but make things into corpses and drag corpses. I don't spend entire raids constantly dealing with buff requests. If the raid wipes it is almost certainly not going to be blamed on me unless I do something exceedingly stupid. I spent far too many years playing classes like Shaman, Cleric, and Enchanter... and UGH I hate getting tells for buffs!
[You must be logged in to view images. Log in or Register.]
You can never have too many Rogues because more DPS is always good. Being able to stroll through any zone I like is very appealing.
The ONLY part I don't like about them is being group reliant. I do enjoy being able to solo, whether for XP or Loot, and that just isn't in the cards for a Rogue.