The Draenei that feature in The Burning Crusade are firm believers in the Light, and I took a Draenei Paladin out for a spin. As a healing class, the Blessing of the Naaru racial becomes another tool to be used in tricky situations, but its effectiveness leaves a lot to be desired. The spell takes 1.5 seconds to cast, with a 3 minute cooldown, and acts as a fairly weak heal-over-time.
The alien feel of Ammen Vale works well with the storyline -- the Draenei are survivors, and much of the questing revolves around healing. The vale is dark and blue in atmosphere, similar to Teldrassil but with hints of Un'Goro Crater's otherworldliness. It's a futuristic and strange place, and serves as a nice bridge between the fantasy feel of the current WoW zones and the new planet Outland.