-Level 90 talents completely destroy the enjoyability of the class because they force you to stop doing damage to do what is essentially self-maintenance.
-Flamestrike is a joke of a spell and needs a serious re-tool (instant cast or have a CD, but not both). It's like a double kick in the teeth when you run the Scarlet dungeons and see them hit your group for the amount it does.
-Fire AoE needs a serious look, having to throw a bunch of homogenized spells because you're target capped is not fun at all when every other class just goes "LOL I CLEAVE ALL!". Watching Blood DKs beat fire mages on AoE pulls when not having combustion up is just legitimately dumb design.
-Frost burst needs a nerf but I'm not sure how you accomplish it without breaking the spec for PvP especially with the reduced control the spec now has.
Overall, not having fun despite putting out decent numbers, considering playing my spriest even if it will underperform compared to my mage purely because it's actually fun to play, and priest spells look visually phenomenal in this xpac.