What is the drop rate of mount?
I had a lot more fun exploring the Thunder Isle, while doing the so-dreaded dailies, than exploring the Timeless Isle. And mind you, I did complete all achievements in both (apart from the "Need a Bigger bag"... ugh). The Thunder Isle exploration, rares, dailies and achievements are all so much better and much more fun.
Let alone the fact the Timeless Isle is useless if you are already geared and don't care about puzzle-achievements. You don't even get Valor in there.
I hope Blizzard sticks more to the Thunder Isle and 5.1 design than the Timeless Isle in WoD... Otherwise, we risk an entire expansion of lackluster content.