I have Fable 3, bought it just the other day, i'm not far, but from what I can tell it's a really great game so far, although I really liked Fable 2 the most. The changes from 2 to 3 that they made I don't like that much, such as there not being a in-game menu, but rather this room you go into to acess all your items , map, outfits, etc. I really didn't like that, as well as the new upgrade system to the jobs, which can't be unlocked until you unlock more parts of the this Road thing.
All in all I suggest buying Fable 2 if you haven't played it. It's much better.