Been a bear since just before 1.8 and lived through all of the changes over the years. I actually love just about everything they've done to my Guardian, and greatly enjoy the "active mitigation" system.
What I don't particularly care for is Savage Defense itself. Sure, 45% greater chance to dodge is wonderful and in theory reduces incoming melee damage by more than 45%, but in the form of a 6-second buff, it's just too goddamned streaky versus single targets (for AoE trash the number of incoming attacks is high enough to even things out -- if you can get the rage to use it).
I'm optimistic about tanking at level 90, but also (naively) hopeful that SD will undergo some tweaks by not too long after I get there.