Essentially all the opinions boil down to this;
Abuse X Y and Z and magic is ok -> mostly meaning you can abuse fortify restoration potions to jack up your damage to about 2000000%; and grinding enchanting to make magic cost 0; then spam destruction spells with the impact perk for stun lock. Its also incredibly boring

Using illusion and conjuration -> summon or rage then wait for several minutes while enemies attack each other; repeat if necessary till dead.
Pick up a sword -> don't play a mage.

Don't play on master -> set difficulty to novice, all problems solved.
If you one shot everything as a mage, you would be back here complaining about how everything was easy and how mages are over powered...
And it is the same routine for any class.
Thief sneaks up and slits throat, shoot arrow, move on. Get ambushed and die screaming like a child or run and hide to come back and try again....
Warrior charges in with weapon X and bash in skulls, get swarmed and die screaming like a child...
Mage goes in, creates mayham, summons a few tanks, takes a few pot shots with a weapon or spell, goes down the cave laughing with glee counting new shiney coins..
When you abuse X, Y, and Z mechanics, all 3 one shot everything than come to the forums to complain about how over powered they are...