I finally got my legendary cloak, [Jina-Kang, Kindness of Chi-Ji]. I really liked the last quest, where Wrathion and Lorewalker Cho told the story of your adventures in Pandaria. It was a really elegant way of underlining Wrathion's philosophies.
I also like the way the last few people to get the Legendary are shown outside the room:
That was a very nice touch.
I have seen some grumblings about how this Legendary is too accessible, a "Legendary for casuals", if you will. I think that sometimes the hardcore forget that skill is not the only virtue. Dedication and perseverance are virtues too, and worth rewarding.
I should mention that this is my first Legendary. I was always the wrong spec or too far down the depth chart for the others. We actually gave 2 Val'anyrs to people who left the guild before ICC. So I may be biased towards a model that actually allowed me to get one.
I think this model for the Legendary is a very good one. It keeps it within reach of every demographic. You only get the legendary in the last patch, mitigating power concerns. The questline is long and involved, and very satisfying. I like how you had to do a bit of everything, even PvP. I know a lot of people didn't like the PvP part, but I thought it added to the scope of the challenge, making it more worthy of being a Legendary.
I hope a similar model is used in Warlords of Draenor.