Blizzard actually said when releasing DK's that they were not supposed to be more powerful than the other classes, that hero classes' only difference was a higher starting level. And yet they are continually going against what they said.

Basically my point is this: having a good class isn't the problem. Having a "hero" class is the problem. Starting a class at a higher level is all fine and well but making it more powerful than most every other class in the game (and equal to those it isn't more powerful than), plus giving it abilities that add to that power and only nerfing it a tad here and there (yet still keeping it OP) to keep people quiet...that's bad.
Anyone remember Starwars Galaxies?
"Oh, It's so hard to get a Jedi!" -Jedi is now unlockable immediately
"Oh, Jedi's die too often" -Jedi are given XP loss instead of permanent death
"Oh, Jedi's aren't as powerful" -Jedi's buffed and never nerfed

Same as with DK's:
"Starting at level 1 sucks" -DK's start at 55
"DK's silence and stun" -DK's get a mini nerf to armor so that people will STFU about the problem

Blizz is just keeping people quiet by providing small nerfs when their Hero class is really, contrary to their original Press Release, more powerful. I for one hope that Blizz is nerfing the hell out of Clothies because in 6 months a Clothy hero class is coming out that is a Super Mage/Warlock/Better healer than everyone.