Apart from the odd glitches, I found the game very interesting. Replay value, I'm expecting to be high. I'm starting over playing the female Hero, so we'll see what variations there are. As far as playing after you've beaten the game, there are a few extra quests to do, but none too exciting. I know I lack 2 Will abilities and the last upgrade for Accuracy, so fighting won't be an interest soon either. I blame the majority of my boredom because of two choices I made, but oh well.
I'm hoping Fable 2 will be one of those games they can continually add new content to, such as additional quests, new maps, and possibly another plot later on.
Also, a question: I was lead to believe that your children grew up and you were able to see them live their own lives. I was only able to witness them grow from infancy to childhood. Do they actually become adults?