With patch 5.2 in full swing, we've had time to take stock of the changes, not just in terms of new content, but in terms of the buffs and nerfs our classes received. I'm just going to come out and say it. As a class, death knights feel about the best they've been since the Wrath era. There's a lot of great stuff to be excited about, so let's go down the list.
Unholy is fun again
Unholy has, as a spec, been sort of on the outside since Cataclysm. Blizzard's revamp, which put unholy on a different rune spending scheme from the other specs and pulled it even further away from weapon damage and toward special ability damage, created a unique melee spec, but the complications and weaknesses that came with that spec were a bit much for many people, and with frost generally beating it in both DPS and simplicity, the spec gained a reputation for being played only by the most hard headed diehards.
Patch 5.2 came along and bought with it a much needed unholy revamp. The addition of Frost Fever to Plague Strike alone has helped make unholy's rotation smoother and more intuitive, as well as made target switching feel at least a little less punishing. AoE is still a little more awkward, but with Icy Touch on Reaping, you can at least get through that first setup and get to the main AoE rotation a lot more smoothly.