American Papist is doing some fine coverage and provides a a roundup of reactions. He notes "Pope: Only Catholics Have ‘Means Of Salvation’" is winning the race thus far and in another post "Vatican hits ‘wounded’ Christian churches."
In yet another posts he wonders about the journalistic coverage since the majority of pulled phrases have been from the commentary and not the actual document itself.
Part of the negative reaction is that anytime you start a phrase with "One true …" you are bound to have the highly relativistic media reaction. They see this a great opportunity for a theological cat fight between the Catholic Church and Protestantism by playing up that within the Church’s view of ecclesiology that Catholic don’t call communities without apostolic succession churches. They will of course not mention that we will call anybody validly baptized a Christian, something that some Protestants are willing to do with Catholics (though this is much improved.)
Though some Protestants are also reacting negatively to this document. It is rather interesting that you rarely ever hear Protestants refer to their church as "the one true Church." It would seem to me that such a claim would be natural to any "church", though I do believe that the Mormons try to make the claim. Maybe since Protestantism is much more highly individualistic and with much of the theology not directed at the visible church that the claim is much more rare. Plus the historical pedigree of so many Protestant churches is tied much more to the current pastor and his preaching style than to a specific set of unchangeable doctrines that can be traced back to their founding.
The Catholic Church can both make the claim as the one true Church and at the same time be able to defend it rationally and historically. Sure some Baptists rely on the phony trail of blood to imagine proto-Baptists that were persecuted throughout history, but it doesn’t bear close inspection. For many the so-called Reformation is the beginning of church history and for others than relate it to when Pastor Bob took over at a non-denominational church (which for the first time in history is finally the one that is fully bible believing). "I found the one true church and really lucked out since happens to be in my neighborhood!"
The great thing about being Catholic is that it can satisfy you on so many levels. If someone asks you who founded your church you can reply "Jesus" with a straight face and don’t have to account for some 1500 year gap or how the church Jesus founded so quickly apostasized. Though of course the only reason to become a Catholic is that you believe it is the one true Church in the first place. Sure there are theological divisions such as in Protestantism, but there is also a magisterium to handle them. People can still dissent from the authentic teaching magisterium, but you know that they are in fact dissenting.
Not to engage in Catholic Triumphalism, but it is really great to be Catholic!