Look at it this way Cupid, both wizards and priests can both blast and support. One is better at blasting, the other is better at supporting.
If you hit 8.6k per charisnumens on gargoyle and considering you get 4 charges, it's pretty awesome imo.
Btw DivinePower is sometimes better than HolyRage, when you can't do double hits and you need more aoe ( with 1 hit divinepower also has more damage )
For examples on my bro's priest in scorpions I very much rather use divinepower than holyrage.