Last time I checked, stamina use didn't increase by going from a dwarven axe to an ebony axe. The ebony axe is a more efficient use of stamina than the dwarven one. Inversely, incinerate is a less efficient use of magicka than firebolt, and there's just no reason for this. Why are your destruction spells getting less and less efficient as you rank up, even counting the magic cost reduction perks AND reduction of cost from skilling up.
Stamina use didn't increase by going from a dwarven axe to an ebony axe?
MAYBE because meele dosnt need stamina in the first place to deal dmg, stamina is used for power attacks.
I can agree the mana cost for higher level spells isnt balanced well but your forgetting that your using a higher dmg spell from a range dealing dmg without any danger to your health and that you can use any spells you want, its not that firebolt gets deleted once you get incinerate.
Fireball 0001c789 A fiery explosion for 40 points of damage in a 15 foot radius. Targets on fire take extra damage. 114 Wuunferth the Unliving, Faralda Adept Missile, AOE on impact
Incinerate 0010f7ed A blast of fire that does 60 points of damage. Targets on fire take extra damage. 255 Faralda, Enthir Expert Missile
(40x2,2x1,5) 126 dmg for (114x0,4x2,8) 127 mana = 0,99 dmg/mana
(60x2,2x1,5) 198 dmg for (255x0,4x2,8) 285 mana = 0,7 dmg/mana
So firebolt is more efficient mana wise but with incinerate you can deal 62 more dmg a hit. In the end it depends on the player what he thinks is more beneficial to him.
http://www.gamesas.com/index.php?/topic/1283497-destruction-versus-one-handed-statistics/page__hl__one+hand+vs+destruction
Melee does more dps, bows probably do as well. You wouldn't even need that link if you've tried both at medium/high level - it's quite obvious. Conjuration most likely as well, if we can record double Dremora Lord dps. All of these damage types can use restoration/illusion/conjuration/alteration. There is no classes. Destro is the weakest damage type when every Skill (including destro) uses enchanting, and even weaker when every Skill excludes enchanting.
Are you trying to be funny

Your comparing exploited to the max meele/ranged with base destro