Yea, it's my first tes game and I'm halfway done with the main quest already at level 19 with 17 hours of gameplay. please enlighten me
you can certainly "beat" the game in under 100 hours, by just rushing down the main quest, however that quest line is only a small portion of the game.
here is an example using the guide book. pages 117-155=main quest. Pages 156-413=side quests

I should add: I liked about 90% of the side quests and almost all the guild progression quests in ES4, and have been enjoying them so far in Skyrim. The mage quests were actually my favorite part of oblivion (hunting and killing necromancers>closing portals) haha