Fable 2 will dominate LBP
So far from my sources I've heard that in it's current state, LBP will receive review scores between 7.5 and 8.5. This is due to a lack of depth in the packaged game, thus requiring too much on the users creativity. Unfortunately if you don't have the time, patience, and creativity, your level design will fail and will not be fun at all. After you spend a couple hours to make a level, which you'll only play for about 20 minutes because it sucks, you’ll soon realize the game is not for you a really just a waste of time. Downloading other user content will help this problem, however it will be difficult to find good levels at first, then eventually all levels will become so similar the game will just begin to get repetitive.
Fable 2 on the other hand will receive between 8.5 to 9.5, not quite perfect but almost everything you’ve read, heard and seen is in this game (unlike Fable 1). A world to interact with, where your actions cause real time consequences for the people and cities which populate the game. You mold the world, your character, kids, wife, dog, storyline, citizens… etc… Tons of depth and skills, outcomes and story paths… multiple playthroughs are a must.