stoneflesh(194 magicka) and lighting bolt(51 magicka)
Ebony flesh is basically a portable suit of magical armor and should cost a fair amount(and does). But thunderbolt is a pretty lackluster standard attack spell and shares this hefty cost. Not a minor flaw. Not just nitpicking the game.
Can we please all agree that complaining about this is pretty justifiable? Spell cost and the magnitude of the effects could seriously use some revision. An entire core gameplay style is affected by severe balance issues. More than any other change or addition to Skyrim I would really like some awareness to perhaps convince the developers this kind of thing is worth fixing with an update.
Honorable Mention-Conjuration absorb bug caused by the astronach perk and stone. Pretty irritating, but not as pervasive as the deficiency in desruction.

