I dug out a WWS report of a Patchwerk kill and looked for a Ret pally. Found one, and he's not wearing any +INT that I can see.
WWS Report The good: Righteous Vengeance accounted for ~5% of his damage. At 1% per talent point, that doesn't look too shabby.
In terms of Mana Regen, he regained 21442 mana over a 2' 25" fight from JotW, Divine Plea, JoW, Replenishment, and Spiritual Attunement. That amounts to 8872 Mana per Minute or ~740 MP5. Spiritual Attunement accounted for slightly more than 10% of the mana regen.
Crunching some #'s, Blessing of Wisdom and Mana Spring Totem each add ~1k Mana per minute, and would bring total MP5 up to ~915.
That's starting to look pretty sustainable in a Raid setting, and should allow some additional skill usage.
If you're running low,
Runic Mana Potion would add a bit of a buffer to that. Late in a fight, LoH on a tank (with Glyph of Divinity) or on yourself could give another bump if needed. Innervate would seem to be a waste, particularly given the (hopefully) abysmally low Spirit stat for Paladins.
The bad: The Ret was near the bottom of the DDs at "only" 4k DPS.
The ugly: He took 42,000 Damage from SotM, and recovered ~8k from Divine Storm. That leaves ~234 DPS of self-damage that his healers need to pick up. Ah well, I guess that's what Lifebloom's for.
What this means: If Ret continues to be near the bottom of the pack on damage, they should get some kind of buff. Now the question is, will Blizzard consider this to be underperforming, or is it "working as intended"?
I have noticed that Shadow Priest performance seems to be a bit lackluster on WWS. I haven't looked for any Survival Hunters, but I'm wondering if Blizzard aimed to have DPS of classes that provide Replenishment a bit on the low side. (If so, they certainly haven't made it public).
Anyway, I thought it might be fun to inject some real raiding #s into this discussion.