You really need to explain the role you want to play and the type of format (pvp-pve-dungeons-etc).

for example. In dungeons I usually tank and never liked melee DD's. It often is very distracting and they can destroy the pull.
But it can work well and it doesnt have to be an issue as long as you know what you are doing. e.g. a good dd melee dk can actually help tanking by tackling escaped adds and to keep the main foe stronger on its place. Just dont expect as much healing as the tank so make sure you stay out of the red circles.

In other formats this is less of an issue. I do recommend going all out on stamina and use weaponskills or skills morphed to scale off stamina. the only exception is green dragon blood, which is great for health and stamina recovery.