Oblivion is harder and more rewarding. Dumbing down the system really took the challenge down in Skyrim.
Leveling system was fine, unless you 'needed' to have a perfect 5/5/5 or 5/5/1 build. Which you didn't. Even without touching the slider.
...I did this every single time cause of my OCD....I had a list to keep track everything. ...I could cut through monsters like nothing...Only game where my OCD was helpful.