oh my bad, last time i checked you had like a level 23 character you were asking ui advice for, and then you went off and played guild wars or something. Anyway everything I've read (and seen) on dk's looks awesome.
Yah, I took a couple month break (or played it a shit ton less anyways) from GW, and now I play both (GW more now tho.)
They are awesome but...stupid. WHY DO I GET TO SUMMON A LASER FROM THE SKY RANDOMLY. It's flashy just so everyone will play them and it's kinda dumb. The thing is, it isn't even just Death and Decay. All their shit is like this. Pretty much every single thing is over the top to be "badass". Why can't my mage shoot a fucking laser down from the sky? Be better than fucking Living Bomb or FROSTFIRE BOLT.
EDIT:
To clarify I think it is stupid because it reeks of just making them LOOK COOL and BADASS for the sake of it so more people will play them or something. None of the other classes come remotely close to this over the top at all and it's a bit silly in comparison to everyone else. (though I'm not sure about the other classes in WotLK, esp. if that Rogue shit is like anime styled where they teleport to hit 6 different people or whatever the fguck.)