Fable I think had even the reviewers fooled by the hype. They talk about how many choices you get to make but I noticed bugger all. Basically it was fun to play as a hack'n'slash go nuts and kill the civilians game.
It also lacked consequence for your actions, I could kill anybody I wanted and as long as I forked up a bit of cash they would all handily forget about it.
Personally I would probably say Fable 2 will be a rental game, it will have a few hours of good gameplay and then get rather boring.