I don't think Mage instant do too much damage though. Excluding nether tempest AoE spam, our sustained damage is lower than melee, same with our burst. 15k frostbolt hits are a joke compared to mortal strike.
How hard do you think a shattered ice lance should crit for against a full mal resil gemmed player with no damage reduction stance/form? What about frost bomb? Give numbers that, to you, sound reasonable.
Thank you for asking,
I would like to disclose that I play resto (2s/3s) and balance (rbgs/pve) on my druid, no other 90s. But I played a mage, hunter, and druid in cata. With that said, I think it would be arrogant for me to claim I know exactly how a mage should be designed and how much damage they should do without being absolutely up to date on my knowledge about the class.
I would like to give my general feelings and concerns and with some additional input from you I would like to recommend some numbers.
Sustained Damage: One of the most over-rated numbers in my opinion "damage done". You can create pressure on an opponent from spread damage, repeated burst, or swaps. Frost mages are unique that they are one of the only caster classes that have marginal damage over time effects (assuming they don't go nether tempest). Meaning all of the damage done is done over a short period of time. So mages can put out more pressure than say an affliction warlock while doing less than 75% of the afflic lock's damage. We should change the discussion from sustained damage to sustained pressure in the case of mages.
Burst: Again it is not an apples to apples comparison looking at mage burst vs melee (warrior or hunter) burst. Should mages crit as hard as warriors when warriors have longer CDs on their burst talents? (3 min avatar) Look at Tosan's latest video running MM hunter, he's ripping off 120k-180k power shots. Why is no one bitching about crazy mm hunter burst? b/c its on a longer CD and harder to pull off. Power shot is a 1 min CD and 3 sec cast. Imagine if frost bomb crit like power shot, it would be obscene b/c the 8 sec CD on frost bomb and easy setup.
Looking at burst you have to look at several factors, not just the total amount of the crit, setup difficulty and cooldown matters.
The problem with mages pre-5.1 running frostbomb + fireblast glyph + icelance spam was how OFTEN not how hard they were bursting. They could force defensive CDs every 30 sec without blowing their primary Cds to do it.