2% nerf to my single target self-buffed damage right now would be ~80 dps, not a huge deal and honestly almost unnoticed due to the complexity of our damage cycle. Letting Rip drop for 3-4 seconds could even give a drop like this.
I hit roughly 4k self-buffed on the heroic target dummy. I have reached 7k on XT in 10 man and average between 4.8 and 5.8 on non buffing bosses in Ulduar. I regularly top the dps charts on both bosses and trash. Less QQ and more pewpew.
Trash rotation is easy, get a few combo points, depending on length of pull, more for longer, less for short and then Savage roar. Wait for energy, Swipe, Tiger's Fury, Swipe spam until SR is almost up, refresh if needed, using Tiger's fury if it comes up again when you have >35 energy.
If you know any actual good DK's (admittedly there are only a few), especially tanks, then you'd understand that they got nerfed decently last patch and this one will be about as harsh as the nerf that druid tanks took recently. Although it isn't class ending, it's definitely painful.
Regardless, comparing our nerfs/buffs to another class is pointless since blizz in it's infinite wisdom has continued to balance dps/burst/efficiency/cc/etc... off of pvp, which imo is still retarded.