Death Knights are fine.
Scratch that, we're more than fine. We're in an excellent position this tier, both damage and tanking wise. The one spec that hasn't seen much representation is getting some needed mechanical changes in 5.2 to encourage more of us to play it.
Overall, we're in a far better spot right now than we were for the majority of Cataclysm.
a lot of the changes are QOL changes...In fact I dont think many people here are complaing about our damage. I think our damage is great. What I dont think is great is our status in pvp. You bring classes to pvp for four reasons, damage, utility, mobility, and cc....we have ONE of those that is reliable and that's damage. Also dated mechanics why is IBF 20RP for dps classes, why does pillar cost a frost rune, strangulate still being 2m cooldown with a run cost. We are the ONLY class with major cooldowns costing a significant portion of our resource. While yes it does regenerate(the frost rune for pof) it makes 2H insanely clunky due to the old blood tap being taken out. I could go on but I honestly dont think you pvp so you won't get it. But like i said I dont see people really saying up our deeps...we dont really need or want our deeps to go up. I think I can say for the vast majority that our dps is REALLY good this tier and we are happy with it we just need serious QOL changes to every spec.