I dont understand, whats wrong with the leveling? Feels the same as Morrowind did to me
There are two major differences between Morrowind and Oblivion in this area: enemy scaling and item leveling.
Oblivion employs Morrowind's leveling system and adds to it scaling. Scaled enemies are not static, they get stronger as the player levels. Oblivion employs a mixture of static, leveled enemies and scaled leveled enemies.
In Oblivion few items are hand-placed as they were in Morrowind. Instead items are introduced into the game via leveled lists. This results in enemies acquiring better equipment as the player levels. If you've ever heard anybody speak of "bandits in Daedric armor" they are referring to item leveling.
Most enemies in Oblivion are not scaled, they are handled just as they were in Morrowind. Item leveling, however, is pandemic. It is everywhere and affects nearly every encounter in the game, even those with shopkeepers. When you put these two game mechanics together, it tends to annoy many players.