Guild Wars 2

Hi, i was looking at share build topic, but it seems lack many of dungeon types builds. Can someone give advice to dungeon thief build? Or thief is useless in dungeon

They are really good if you have fast reaction times and/or the places where group stealth is needed.

In high level fractals i tend to use more guardian because my thief gets 1 shotted by everything plus they have more useful skills.