Every other TES game had a huge variety of spells for each tree of magic... That is not the case with Skyrim.
Right now.. I am level 14, 50 Destruction, 30 One Handed Sword, 28 Restoration, and it is impossible to kill enemies.
I play on Adept difficulty and enemies basically destroy me in 3 hits.. and my spells? Not fast enough to kill them.
Sometimes, to my dismay i am forced to turn the difficulty down to Apprentice.. or Novice.
I personally believe Magic is NOT well developed in Skyrim and the developers mostly focused on the animations/graphics of the spells itself. Not the stats, or the perks..
Don't get me wrong, I AM ADDICTED TO SKYRIM, but this is a major let down because I hate playing on lower difficulties than the norm..
Hopefully Bethesda will fix this in a further patch.
Looking forward to your opinions on this issue.

