I started to play DK 5 days after WOTLK shipped.
Got best possible gear for DK in different variations (for two handler, DW, and different trees).
I was topest guild dps since January. And the only DK among top 5 dps players and we have a lot of DKs in guild.
I was top dps as blood, as frost (my favourite), as unholy and as frost/unholy DW spec.
I say it just only you know I know class little bit.
I don't like changes in 3.1. I don't like idea moving Howling Blast to bottom of tree. It was really fun spell and what we got instead? Obliterate? Thanks, I played warrior 2 years before, what is difference? It was fun to have a choice to make your DK more melee or more spells oriented. When Blizz are moving important abilities to bottom of trees (and HB will be even more important) - they want less possible builds in game. It is easier to maintain when there are only 1 good build for class. Less work to do. But sorry, it was big part of game for me to play with builds and to be different (yeah 90% pvp holy paladins have same spec, yeah 90% dps warriors have same spec - how fun).
So do you like DK changes in 3.1? if yes, then why?
Obliterate is not so fun to play as HB (at least for me). I want my choice back.
Also I don't like any other changes they are making for dk in 3.1. Buffing, nerfing, buffing, nerfing. Boring and stupid.