All things considered, the Midsummer Fire wow gold is probably the least-changed holiday overall and also probably bears the most resemblance to the current Lunar Festival (i.e., running around the world getting items from specific locations, etc.). If you don't like running around to all the elders for the Lunar Festival, it won't suddenly get better during the Fire Festival.
My pick King of the Fire Festival is the obvious choice. However, Burning Hot Pole Dance -- now that you can't return Fire Festival clothing for a refund -- has attracted a lot of complaints, as it eats up so many Burning Blossoms that players might otherwise have used for novelty items and a pet.
Brewfest
Brew of the Year would have been the pick wow po if Blizzard hadn't removed it from the meta, but it's no longer a concern.
My pick Hmm. Nothing really comes to mind. Brewfest is probably WoW's most trouble-free holiday.
Related to:
http://hi.baidu.com/gehd782/blog/item/2dde521cdde032e4c2ce7908.html
http://home.q.yesky.com/space.php?uid=13960422&do=blog&id=865947
http://huochetou72.blog.163.com/blog/static/1888240562011517102258220/