I love storm destruction. Its my favorite when I use destruction.
First, it is the least resist of the 3 (frost being the most resist... Normal if you think that most of Skyrim is not really hawaii)
Second, I found the second effect of the storm damage the most usefull,mostly against casters and Dragons.
Third, the Storm "low health" perk Desintegrate is the only one of the 3 in my eyes that worths it.
And desintegrate is nice for an assassin. No corpse left, only a pile of ashes... To bad I cannot take a broom and sweep it. Assassin first rule : no witness, no corpse, no clue left behind