It depends on how you look at it really.
In Oblivion, magic was treated as a "secondary" skill set, it was used solely as buff to melee weapons, which is why magic didn't take up the use of your hand like physical weapons did. From this standpoint it was GREAT for battlemages, and similar classes. Oblivion however suffered from a small range of actual physical spell effect, it was either cast on you or cast on someone else.
Skyrim on the other hand makes magic take the same priority as weapons, so you can't hold a sword and cast magic from the same hand. This brings magic up to the same importance level as melee weapons, which makes playing battlemages harder, but Skyrim introduced many more physical spell effects then Oblivion had, thus increasing what you can do with magic.
Skyrim has
-Elemental cloaks that wrap around your character, protecting you form harm.
-Sprays that spray elemental damage onto floors, creating walls that damage enemies as they pass.
-Runes that can be placed on the ground or walls as traps that explode when enemies come near.
As well as the other types of magic projectile, magic projectile + aoe, etc. etc. Oblivion had.
In the end it comes down to Oblivion was terrible unbalanced in its magic, since everyone could use it no matter the class, thus making everyone battlemages. Whereas skyrim forces you to actually play more mage like, but also gives you more effects.
TL

R
-Oblivion if you like battlemaging
-Skyrim if you like normal maging
Also, if you get the Dawnguard DLC for Skyrim you can get several skeleton summons, ranging from skeleton warrior, to archers, to skeleton mages, if you want that fix.