If you don't like your ret for pvp, you will like dk even less. Dks have more burst and are (arguably) slightly less vulnerable to cc BUT their survivability is shit as you only have 1 reliable self heal (death pact), the other requiring that you have a full rp bar, lichborne off cd AND an opponent that is dumb enough to just let you stand there for 4 seconds to spam deathcoils.
I played dk since day 1 of wotlk and I would not advise you to roll one.
Unfortunately, it seems warriors will be crap too, as always. Nerfs to damage are already rolling in. Warrior is never a good choice for pvp unless you know you have a reliable babysitter.
---------- Post added 2012-09-21 at 12:47 PM ----------
Ironically, your most dangerous enemies are actually melee.
---------- Post added 2012-09-21 at 12:48 PM ----------
That one is always reserved for when you need to heal. Using it just to break a fear while you don't even have a full rp bar, means you won't have it later on when you need to heal.