Discs problem is that it just has no niche anymore.
We always had the least mobility and some of the worst defensive CD's... that was fine. We made up for it with the offensive pressure we could generate, but now we aren't even the best at that.
Why bring a priest, when a holy paladin can do more damage (while healing his teammates for 200% of the dmg done without needing to apply atonement or anything) , while still having the best healing throughput and the best defensive CDs?
So what do we offer? It's not instant healing/absorbs anymore.,.. PW:S heals for what, like 160k? And there's absolutely zero dispel protection anyway.
It's not CC... PW:S is MAYBE better than HoJ, but every other heal has so much mobility that good luck actually trying to use it. Druids have the CC they've always had, Shamans have a 10 second CD HEX, and monks have an instant cast ranged incap AND an aoe STUN with a CD that's only 15 seconds longer if we talent our fear down to 30?
It's not healing throughput (probably due to PW:S being so dogshit).
Paladins do more damage, and they do it all insta-cast, while healing their team for 4x more than we can heal our teammates for. Sure it's a minute cooldown, but it has a 20 second duration.
It's also not dispels. They decided to give all healers defensive dispel in whatever shit expac while giving priests nothing in return. And it's not offensive dispel either because funnily enough, the only healer that it's actually remotely good against is other disc priests. It costs way too much fucking mana to ever use against something like a druid.
It sure as shit isn't defensive cooldowns either, I don't think I need to expand on that at all.
So what's our niche? We are the healer that in the rare chance we can free cast and no one needs topped off, we can do maybe 10% more damage than a holy paladin?
Sorry, but I think it's clear why the other healers that all have better CC, better defensive CDs, more healing throughput, more mobility and in some cases better damage are doing better than disc priests.
Our one saving grace is that shadowmend is on a different school... so now instead of just chaining shadowmend, I can chain shadowmend AND clarity of will. If shadowmend didn't exist, priests would be in the worst state they've probably ever been in. And even with it existing, it's not actually fun to enter an arena and have to spam shadowmend 12 times in a row with PI and archangel and still not see anyone actually get topped off. I don't know about you guys, but I rarely have a chance to actually do damage in 3's.