What do Paladins want? They're currently the best healers and Blizzard are nerfing them like they nerfed MWs when they were the best healers, and Disc Priests (although those nerfs didn't really hit all of the balance issues with the spec). The Revival, Tranq and DH changes were made, in part to help balance healing, but also in part to help balance raid format design and balance.
The Mastery nerf really wasn't surprising, if anyone is surprised at it then they're deluded. A Paladin, albeit in normal content mostly, can have their Mastery absorbs up to as much as 50%~ of their overall healing. Absurd is the only word for that.