Blood Death Knights at the moment if anything aren't to great, and are behind in damage, Unholy is scaling to well (in particular their minions).
It will also be pulled down in to line, rets aren't over powered to much, it is really just their stun that is a little much considering their burst damage. However, I find it ironic that rogues are complaining about being stunned.
All classes should roughly be equal in the end, but I have no doubt that a few weeks after WOTLK hits live various bug fixes / class changes will happen.
One thing which amuses me is the amount of people saying they will chose a DK. I don't think they realize that it won't be "better" than their current class, but instead just be different. I do like the fact DK's are among one of the most complex classes, and if the Beta is anything to go by, according to all accounts, most people quit their DK to go back to their main.
Especially when all your friends are telling you how good North rend is (I have to admit, a few instances look fantastic, not even talking of just the level 80 ones) and you realize you still have 25 levels to go
Yeah I saw DK's quite low on the DPS in a WWS report a few days back, will have to see how they end up scaling with gear.
Aye I'm hoping a lot of people back off DK so we're not completely overrun by them, I'll be sticking with mine, got extra motivation because my old guild who are reforming don't have any DK's yet.
Also looking forward to the DK class mechanic.