Man seriously, NOTHING can survive a well placed pool of wall of storms/fire/frost. This is easily the most powerful set of spells available in this school of magic.
You can svcker enemies to waltz right in it, and laugh as they die in a matter of seconds. Ranged attacks require a different tactic.
Not good for dragons, I think(haven't tried but they do pack the most HP in the game). Go on try it, you'll feel differently about the school.
And the fact that it is unaffected by the Augmented Fire/Frost/Shock, doesn't matter. Always a flat 50 damage per second. The only downside is you need 75 Destruction.