i have to say the designers of DK are stupid, or they are really hate DK. They really did a good job to destroy DK.
Here's are my views to improve:
1. When Killing Machine, crit should increase the crit damage (like warlock)
2. Soul Reaper is a foolish skill for Frost, at least the type of damage should be changed, shadow and frost is better
Although I agree DK Dps is a little low (although still competitive with the little bit of utility we bring), I also believe this post is not thought out or constructed well enough.
For your first point, you are only offering enhancement within one spec of the class.
For your second point, you are only talking about the downside of it being a frost ability.
There's not enough in this post to take it seriously.
My main is a DK and I do very well as Unholy. We got passive buffs a little while ago, which helped us a little. I'm also in no position to theory craft how to make our abilities more prominent, but the way it's worded in the OP is not how you do it.
How about finally changing the playstyle since Pre-Cata?
Monks, and other DPS classes, are =====>>> over there. If you really want to play something with a different style, grab one of them; they eagerly await your reroll. Because, seriously, unless you say *why* it needs to change it sounds like "I am bored, but don't wanna reroll", and that is a bad reason to change things: change for the sake of change generally ends up sucking.