I was one of the defenders of Pandaria offering a blank canvas in terms of storytelling, and the potential undertones that such a visually colorful expansion could have. But no, it had pandas so it had to be a dumb filler and the death of WoW. Now Chronicles is out and the stories that were created in MoP have become the origins of Azeroth.
I remember getting virtually lost from 85 to 90 and not stepping out of Pandaria once. Immersed in the questlines and the breathtaking scenery.
Max level 5.0 was a bit rough, the reputations weren't well designed at all, and the raids, while mechanically good, were a bit boring.
But man did 5.2 and 5.3 exceed my expectations. Thunder Isle and the Timeless Isle were also great. The content drought was... well, to be expected.
ToT is, to this day, my favourite raid, and yes I played when Ulduar and ICC were released, they didn't resonate with me nearly as much.