For level 50 content. DRK is the best as a dps instead of tanking. IT has a strong enmity combo, sure, but PLD has only one combo. PLD should be the tank in 50 raids. Warrior has some other combos, but it'll lose some potency by it. Whether the PLD or WAR decides is tank or not, both have shirk to help reduce their enmity. I can't say anything on the matter for HW, but PLD has 2 new combos for HW, and DRK just has more ogcds. As someone has mentioned, warrior is the best at pulling, so why not let it do its job?