Yeah well it's pretty true, I know a lot of noob DK's but usually they don't get far. It's easy to sort out the bad DKs and the good, pretty much just based on their gear. If the player's a great player who's got a good level 80 main and makes decent gold and knows decent people to run with, they'll be able to access great gear, they'll gem and enchant perfectly and correctly, and be able to pull their DK out of the scrub pile. But this is just generally, I know a lot of scrubs who have excellent gear unfortunately just because their friends carry them through content. It's pretty hard at levels 70 and under to be able to tell how good a DK tank really is, because of their lower threat generation than other tanks (I'm pretty sure) and just cause while leveling, I've noticed that there's really no decent gear available for DKs mostly during quests. Because in Outland and previous, the gear was not in any way itemized for DKs simply cause they didn't exist back then. It's Northrend and beyond where you really actually get to see some decent changes for em.
Anyway DK's are only OP in Outland because they leave their starter zone decked in blues... after that, pallies are still the ultimate OP class.
But yeah that would be awesome, can't wait. :]