Allow me to provide the voice of pessimism:
Fable 1 was notorious with it's side quests, in the fact there weren't any of "beefy" proportions.
Doing EVERYTHING in F1 took me 20 hours or so. I beat that $50 game in 3-4 days. Many of the same sidequests exist - get married, have sex (this time its for kids), buy houses, and the like.
Fable 2, to warrant anything more than a rent from me, needs to be a bit beefier than that. Having a 12hr+ main quest is fine IF YOU ACTUALLY HAVE SIDE MISSIONS. Fable's side missions were 1-off adventures that took 30 minutes a pop, and weren't nearly as involved and good as Oblivion or Mass Effect's (say what you will of either, but either game had better missions).
But, having said that, Fable was great in terms of gameplay, and with 2 player co-op, I might be enticed to buy my fiancee a X360 quicker, so we can play co-op.
Back from the dead, I'm afraid.
