Add to that the fact that Savage Defense has NO internal cooldown, and any druid worth his salt will be spamming Swipe on multiple mobs, AND the fact that each mob the Swipe hits has a chance to crit.... Savage Defense will basically have 100% uptime on multimob packs.

So for multimob packs, an average druid tank with 45% crit will crit each Swipe on at least one mob, thus proccing SD.

It can also apply the reduction to multiple attacks if they land at the same time. This ability truly shines on multimob packs, which is basically the opposite of what the article would imply.

The rest of your comment seems to have gotten cut off, Dawn. I can see a "More..." link but when I click it, nothing happens but a page refresh. Perhaps it's a flaw of Firefox.

I appreciate your efforts to research the subject :) Being someone who does live and breathe druid tanking (I have both a tauren druid and a night elf druid, and plan on levelling both a troll druid and worgen druid in Cataclysm... crazy, yes I am) I see a lot of people misunderstanding druid tank abilities, strengths, and weaknesses. No longer are we the mana sponges with the crazy big health pools, spikily giving our healers mini-heart attacks. :)

And we are actually the least affected of the four tanking classes in ICC due to Chill of the Throne... not, as is commonly thought, the most. Here's a great post by a bear much smarter in the ways of the Math than I:

http://wowthinktank.blogspot.com/2009/10/general-druid-icewell-radiance-bears.html

Yes bears can actually be the smoothest tanks to heal and will often take the LEAST amount of damage. As you move up into the heavy hitting raid bosses like a festergut, the value of the feral armor advantage begins to shine over block value as it reduces a % of damage versus a flat number.