I've heard about people who expected more from it, but I wasn't one of them. I actually didn't know anything about it except that supposedly it was good. I'm not sure how exactly to put it. I always enjoy it when a game doesn't take itself too seriously. But Fable... maybe it was trying too hard. Or maybe it crossed the line from being "not serious" into "clownlike." All I know is that if it was trying to be funny, it wore the joke out early and kept stringing it along with a straight face, and if it was actually trying to be serious... god help us all.
Another thing I always have to keep in mind one thing, there are people who love Diablo. And that's all Fable was, a hack and slash action RPG. (with the most atrocious dialogue in ages)