I really dont understand what everyone is up in arms about. I bet if they had actually put these changes in a week before they had announced them then no one would have noticed a difference. Threat hasnt been an issue against dps for a very long time in raids. The only time I ever noticed any bit of difficulty was during certain tank swap fights but even then my other tank and I would just communicate to slow dps and let the other catch up. So this whole idea some people have that the removal of threat as a mechanic is just dumbing down the game is ridiculous. And since the threat mechanic has in reality been such a non-issue for the last three years I also dont understand how some can say that it was something they really enjoyed or something that set a good tank apart.
People were up in arms all over this before they even set foot in an instance or a raid. And really fellow tanks, if this dumbs the game for you, your healers, and your dps as much as you claim it will then I will expect each of you to be posting here in the next couple of weeks with the Firelord title in front of your name. The game is still extremely difficult at the proper levels and if you find that the removal of the threat mechanic simplifies the game for you so much then find a raid that is worthy of your skill.
I apologize for sounding abrasive but I get so very frustrated with many in the community who seem like their sole purpose is to be critical of every single change blizzard makes and claim that its something they do for noobs only and will make the game too easy and boring for the "real" players. The reality though is that the game is just as fun and just as if not more challenging than it ever has been. Furthermore everyone is concentrating on the buff to threat and almost completely ignoring the bigger more exciting news...
The introduction of active mitigation to tanking.
This is perhaps the most ground breaking change to the tank role the game has ever seen and it makes complete sense. How much did Blizz tell us they wanted dps in Cata to feel more powerful. They changed the dps model away from strict rigid rotations to more progressive reactive ones, as well as cut down the amount of damage from auto attacks and made your abilities give a feeling of more power. They changed the healing model to reward efficiency, mana management, and spell usage. Tank reconstruction was naturally next. They discussed they love the idea of how DKs have more of an active role in their survival and work harder than any other tank class for it. And though there are changes that need to be made to DKs (which he also said in a later post would be happening perhaps as soon as 4.3) the idea behind tanks being more active in their survival and mitigation instead of throwing on gear and having it just be passive and something you dont work for is maybe the most exciting news I've ever heard for our role. If you really want to separate a good tank from another they are going to give us the best way to do it.
As a community lets try to be less critical of things and more positive about what's ahead. I encourage change in the game as it keeps thongs fresh.