I do agree with a lot of points Greatbrae made, but for me, it’s more about solidifying what that underlining “identity” is for Ret Paladins.
Which is an extremely hard task given their current circumstance of being very easy to play at low ratings, and being able to see good results because of it.
But mainly as I mentioned before, it’s this idea that Ret is stuck somewhere between being a “Melee” and being a “Caster,” that those like “shortcomings” are much more exploitable the higher rating you go.
And this is just where it comes down to the individual and kindof what [you] view Ret Paladins should be.
For Example:
Melee
You want these things because the longer a game goes, which is quite often 5+ min in 2s, the higher Dampening increases, (which is the -Healing Taken Aura arena has implemented), the more impactful these abilities become.
The Value of MS goes up with Dampening because it’s harder to heal, while the benefits of “Off-healing” goes down.
In these games, being the only melee without a MS or Purge, Z-axis Movement, or having a dispelable stun, etc… feels awful.
Caster / Mid-Range
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I’d argue this is the less desired role most players want because the “Melee Toolkit” is a tried and true method. It’s basic, easy to understand and effective, and I’d argue Ret is still seen as “melee…”
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But there are players that want to fill in more of that “Support Role” but Ret yet again can feel like they lack these tools
- Not having a Ranged Kick
- Not having a Purge
- Not having a Knockback, Root, Teleport, etc…
- Not having strong Off-Heals (Healing Hands being nerfed)
- Not having a strong self defense, so abilities like BoSac get more value (Just zerg the ret)
Now in addition to wanting these type of tools, some Ret Paladins also want Magic Cleanse to come back to Ret, BoP and BoSanc to have a better AoE perk (Spreading the Word PvP Talent), or some other new Blessing to be implemented, WoG and FoL to have PvP Talents, etc…
Mainly, it comes down to wanting more effective off-healing, or ultimately more tanky-ness so that “Zerg the Ret” isn’t an effective strategy-- so it makes your BoSac and Off-healing feel like they have more value.
It’s kindof like that Augmentation Evoker feeling, and wondering how can you discourage players from just zerging a Ret so that BoSac feels awful for them to play into, but rewarding for the Paladin?
This is what made Ret/Warr/Monk so hated in SL. 
Then this is where those questions come into play, and basically where [you] want Ret Paladins to fall and what should they TRADE to get there?
Keeping in mind the homogenization of the rest of the game, giving Paladins a more defensive/caster perk-- while giving Warriors improved Beserker Roar-- is going to make a lot of players hate Ret/Warr/Monk again.
(Why I ask if Arms warrior has encroached too much on the Paladin Design. >.>)