Video games are basically interactive stories where you play one or more of the characters involved. Fable...well, the first game is like what happens when someone promises you the most delicious chocolate you've ever tasted, stuff that will truly push you into enlightenment, and then hands you a regular mass-produced candy bar and says, "Enjoy!"
Fable 2 is like when someone says, "Hey, this chocolate is going to be great. Not stellar, this won't blast new and wonderful ways of perceiving the world into your consciousness. But you will have fun with it!" And then they give you exactly that.