While I do sometimes miss the level up system the new system in Skyrim is waaaay more advanced/intuitive. No longer are you constrained to a certain type of armor based on your class. If you want to upgrade your block and restoration then you can be some sort of warrior, healing tank hybrid. Or you can specialize in archery and conjuration to sneak attack with a bow and conjure a pet to help fight. It's so incredible the diversity of possibilities you can do (granted if you want to really specialize in one "constellation" you need to devote a good amount of levels, but you still have the option to be a hybrid).
But I think we're comparing Oblivion to Skyrim a little too much. Of course Oblivion isn't as good as Skyrim, because Skyrim came out later, it got improvements over Oblivion. On a whole Oblivion was epic on 360 (didn't have a good PC back then) and I spent well over 70 hours on one playthrough. The large land, dungeons, armor, and everything made that game. But of course Skyrim is larger, again, why wouldn't it be? So it's a little unfair to rate it against it's successor.
Overall Oblivion gets a 91/100
Some things could have been done to improve some aspects of combat. I was most sore about mage spells in Oblivion.
Skrim gets a 96/100
A lot of things about Skyrim is great, the size, the content, the feeling of being integrated into this fantasy world, and being able to fight dragons and absorb their souls, who doesn't like that?