I'd say it's worth it. My first save, when I finally finished the main quest, clocked in at 132 hours. That's for one character, and I still had scripted side quests to finish. There's a lot to do in Skyrim.
Compare to what? That's one difficult question because we have no idea what kind of games you enjoy and what you expect from The Elder Scrolls V: Skyrim. Have you played any of the previous ones?
No, but i have played almost all of the fallouts and i like a lot of RPG adventure games