Some of you are making a mountain out of a mole hill.
"They're dumbing the game down?" "Giving out free crutches?"
All this does is allow DK's to reach the uncrittable cap more easily. Until this patch there are no def rating 2-handers, which means unlike warriors and pallies who can get a tanking sword and tanking shield with points towards the def cap, we get zero from 2 slots. The upside is we need to get a lot more better tanking gear before we can hit that cap. I had to dps my way into heroics and the like just to get the gear to tank them. THAT is what Blizz is trying to remedy. I don't hear anyone crying in their milk over the fact that druids don't need any defense or resilience to be uncrittable, ever....
This also doesn't dumb the game down or make tanking any easier on DK's other than bringing the uncrittable cap more easily within reach. Tanking is still as hard as it ever was. 25 def skill (which is ~132 def rating, incidentally), is not "too much to get for free." The class skill of runeforging is one of our class skills to through in the balance. You get permanent weapon enchants instead. We already get a 4% parry buff that is not subject to diminishing returns (and is arguably much better for someone over the def cap) but NO ONE is crying about that.
Some of you have such a pejorative outlook on changes they make in the game that you make a big fuss over a small matter that may not even affect you. Grow up and start acting like an adult.