Just tried something now for laughs.. My retribution paladin using Seal of Righteousness and using the 4 dps abilities we have DS, CS, Judge and Exorcism. I did 29k dmg when all of the crit, this is in PvE gear using Bloodfall heroic. On a 1400 resi shaman the chance of all of the critting would be like 5% or something so those 4 abilities would perhaps do 15k dmg if you're lucky. That is not even close to what rogues or warriors pump out in 4 gcds.