Try not playing on adept.
Right, because if you don't play the way Flowz0r does, you are playing wrong. You must play on higher than normal before what you think counts.
You know, because increasing the difficulty of the game should not make the game more difficult?
I thought sure that I seen somewhere where a person used the console command to raise destruction from 15 to 100 and noted that the two spells he tested had a damage increase and cost decrease.
To me it seems like destruction scales with the level of the skill, but not the level of the player.
Now here comes my point, if you want to play a pure school mage, or only branch into one or two other schools or skills you really should not be much further than the mid 20's.
I think the issue is with player who raise other skills and the level they are at, in that point destruction would not scale after it is already 100.
Non combat skills raise your level, and that's the problem I see here. There is a point where destruction will no longer do more damage on its own (100 skill) and at that point if you start raising level though other skills that are non combat you are in essence doing this to your self.
Thats why leveling non combat skills to raise to high levels is a bad idea, trust me the same thing goes for warriors too. I raised blacksmith quite high along with other skills there where not related to combat and got punished for it. Thats why I started a new character.
I don't expect what I just said to be popular, but its my hypothesis on the situation.