If you actually want to use more than 2 skills from the DK skill lines... go with magic build and spam molten whip.
Tanking isn't great atm... and going stamina dps is basically just using weapon skills that all classes can use. (you might have 1 or 2 dk skills on your bar for buffs... nothing really for damage.
Or you could roll a sorc or nightblade.... thats what i did. got tired of the lack luster DK.