Penace damage should be increased or REMOVED and made self castable.

[Schizo]

Penance lacks compared to the very similar spell Holy Shock.

Holy Shock at highest rank:
Blasts the target with Holy energy, causing 1296 to 1402 Holy damage to an enemy, or 2401 to 2599 healing to an ally.
18% of base mana, 20/40 yd range, Instant cast, 6 sec cooldown.

compared to Penance at highest rank:
Launches a volley of holy light at the target, causing 288 Holy damage to an enemy, or 1484 to 1676 healing to an ally every 1 sec for 2 sec.
16% of base mana, 30/40 yd range, Channeled, 10 sec cooldown

Penance is a 51 point talent as well. The damage utility is useless for how little it does. Using penance as a damage ability leaves you open to interruptions very often, hindering your whole holy arsenal of spells. Holy Shock on the other hand is instant and almost half the cd. The damage should be increased or removed altogether to make penance self castable. Why should 31 point talent on a Holy Pally be superior to the 51 point talent in Disc?

[Huji]

Considering how many other healing spells priests have, you can't exactly go asking for every single ability to be on par with what other classes have.

Why would you need a self-castable channeled spell when you have Binding Heal and now, Desperate Prayer for 11 points in Holy.

Given that Disc priests are supposed to be tank healers, channeling Penance on yourself would be idiotic. Either one of the raid healers will get you, or cast Binding Heal, or even a quick Flash Heal as you shouldn't be getting sustained, continuous damage anyhow. And if you were (getting continued dmg), then channeling that on yourself would be useless as the duration gets cut in half...

Edit: And I'm not sure on this, but I'll assume that the coefficients for Penance are also better than those for Holy Shock as the latter is instant cast. So you can't exactly look at it just from tooltip numbers.

[Karpalo]

Well penance seems just weak. You do propably around same healing with flash heal and better dmg with smite or holy fire.

[Schizo]

Penance isnt weak. When you start channeling that spell, you get 1 tick from it immidietly, on 1 second another tick and on 2second last tick. Its almost guaranteed 2 ticks, and possible 3 ticks.

As a healing spell it can have its uses and is very decent. I'm sorry but 400-500 damage when having near 1000 spell damage is pointless. Increase the base to do 600 damage per tick instead of 288 and then we're talking.

[Mandible]

You can still do the same and more by speccing holy, so discipline is still far from being a tank healer or single target for that matter.