It may be funny or a joke to you but it's true. PLD requires the least, DRK and WAR contend for being the most difficult to main tank in. OTing is all easy, but the problem lies in the fact that WAR, with a simple rotation with overloaded numbers can out DPS a BRD if he gets to full time hayday in Deliverance... and it is a problem because the Bard has to work his ass off, especially if he has to Paeon or Ballad.. to pull those numbers while the WAR doesn't have to do anything that demands mechanical prowess.
This is the problem I have with Warrior as a class.