The best replacement for dk is warrior.

The best alternatives to dk are rated as following:
★★★★★  warrior
★★★  paladin
★★★  rogue
★★  pally
★★  warrior pvp
★★  monk
★★  bowser
★★  worsted weight yarn
★  warlock
★  ig
★  worsted
★  mario
★  mage
★  paladin 5.4
★  pally 5.4
★  hunter pvp
★  ret 5.4
  ig ti3
  sport weight yarn
  rogue 5.4
  hunter 5.4
  alliance
  dk
  frost dk
  unholy dk
  pally tank
  arms warrior
  haro
  ret pally
  yoshi
  warrior mop
  frost
  aran
  navi
  shaman
  worsted yarn
  pcd
  priest

Your alternative for dk is not listed? Suggest!
Speaking about dk, one probably shouldn't forget about dual wield.

Other search terms related to dk and their ratings are:
★★★★★ dual wield
You have in mind a companion for dk and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of dk in all years. Click on graph for more.
dk
warrior
paladin