I don't think I should be able to one hit a Dragon Priest or anything, but I hate getting locked into an impact-stun Thunderbolt (or whatever expert spell - even master spells) battle with them because it goes on for ages. If I don't use dual wield it takes even longer. I'd rather send in two Dremora, who make quick work of them, while I loot. My husband's big buff Nord can wallop them too (he didn't do the alchemy/enchanting/smithing loop) with an unenchanted Ebony War Axe.
Mages should be squishy, but they should be able to lay down hellfire. I just want more hellfire is all.
Vs an undead dragon priest fire does extra damage to them. Also make sure to get the necro-mage perk, should drop a dragon priest really quick w/ incinerate. Also theres an illusion perk that raises fire damage. (on accident)
I find the cloak spells, chain lightning, fireball, ice storm, the expert bolts, and firestorm to do a lot of damage. I play on master difficulty.
I'm not going to say that conjuration isn't more powerful I just find it extremely boring.
Also what difficulty are you playing on? Cause keep in mind a lot of people that complain about damage are on expert and master which the game isn't balanced for.
Difficulty | Damage Dealt | Damage Taken
-----------------------------------------
Novice | x2 | x0.5
Apprentice | x1.5 | x0.75
Adept | x1 | x1
Expert | x0.75 | x1.5
Master | x0.5 | x2
It is by no means an insult to consider turning down the difficulty if you want to do more damage. The game is balanced around Adept.
If Bethesda added 20 more levels of difficulty and there were people that found that fun and challenging, there would be people on this board that would complain about something on the hardest difficulty, when it was never supposed to be balanced in the first place.