Dispelling two buffs is very strong against classes that rely on magic. Priests in particular are very weak to double purge.
I saw an idea about the glyph in a different thread:
- Purge now dispels one additional effect, but its cooldown is increased by 3-8 seconds
or how about
- Doesn't work against players (Only useable in PvE)
I don't think I have seen a single shaman that doesn't use glyph of purge... :S
Would that be acceptable? Or give all offensive dispels an 8 second cooldown. That would give shaman an edge with offensive dispels, but they wouldn't be as crazy as they are now.