The thief class in Guild Wars 2 appears to be one of the more complicated classes in the game. It is the only one with a limited resource pool for its’ primary skills and none of them have cool downs. This could give them the potential for the massive burst damage the class historically offers. Granted the lack of a cool down on skills will make it easy to spam the wrong attack. Also the thief’s third attack option changes based on what off hand weapon you have, unlike any of the other classes. While in the short duration stealth the game uses, the primary attack changes into what appears to be a high damage attack. Even though thief has one of the more limited selections of weapons available, the synergy between main and off hand seems to make up for it.