One unique thing about the Priest class is racial spells. Every race has their own traits for all classes, like Dwarves' Stoneskin and the Undead's Cannibalize. However, Priests also have special spells that are only available to certain races (each race gets two of the racial spells). Fear Ward is probably the most infamous; it's a 10-minute duration targetable buff that absorbs one fear effect, and is available only to dwarves and draenei. This leads to the common contention that the best race to roll for an Alliance Priest is dwarf, because Fear Ward is far better than all the other racial spells. Some racials are obviously trash -- my own Priest, being a human, has Desperate Prayer, which is a free instant self-heal on a 10 minute cooldown, and Feedback, a sort of very expensive mana-burning aura. Desperate Prayer is pretty decent, but Feedback is such utter rubbish that I can't even bring myself to spend the money on training it.
As you may imagine, this is perceived as a sub-optimal situation by many Priests, including this blogger. However, it's not immediately obvious what the best way to fix it is. Remove racials entirely, possibly making some of them baseline abilities trainable by all races? Keep the lower-powered racials and baseline/remove the high-powered ones? Eyonix recently said it's likely that at some point in the future, you'll see additional improvements to priest racials -- what improvements would you like to see?