Ug. The more I play this game, the more I realize what genius NoX was. I would kill to have the same skillbar interface in all my games.
There is nothing worse to ruin a nice immersive game like Oblivion than having to pause the action, look through my spell list, pick a new spell, cast a debuff, open the menu again, and reselect my original spell.
If you rolled a caster in this game, you'll hate Bethesda's interface team.