You could also argue that Oblivion's level-scaling is done really well and innovative, as each monster generation stays for several levels, and is replaced by a new one as soon as you are getting too strong for them (I'm over-simplifying). I have played Oblivion for almost as many hours as Morrowind (including mods like OOO and total conversions), both with the main goal of trying out different roles (fighters, mages, rogues, pacifists, good guys, bad guys, etc.) and personal rules (no melee, no armour, bare hands only, conjuration only, no fighting at all, etc.) and goals (role-dependant, not necessarily completing the main quest). Daggerfall's level-scaling is less 'offensive' - or Daggerfall is less immersive, I'm not sure.
You walk around, fighting rats, you level up, and bang, the rats have turned minotaurs! Hard to accept for a role-player. The main reason is that it's immersion-breaking.
I don't COMPLAIN about Oblivion's level-scaling, I simply say I don't like it.
