How can someone find DK DPS boring? Have you seen Mages? They literally spam 1 button, and a 2nd button when sh1t procs... -.-
A DK at least has some randomness, fluidness, and fun to it's rotation.
DKs rock PvP. They're pretty much good against anyone if you know how to play it, though I've had troubles against Pally's. DKs can solo pretty much anything pre-MoP, and most importantly.... They have glowy eyes :P