Fable 3 was an interesting game, but one that was nowhere near as good as fable 2
For me fable 3 was one of those games i played all the way through because I bought it not because i was enjoying myself, the game breaking glitches I ran into on the main questline, combined with a story that I frankly didnt give a shit about, made Fable 3 a grind to finish not a quest to see what comes next.
Fable 2 on the other hand had a very good buildup between you and your sister, which gave me real desire to get revenge, it also was able to show you the impact of your choices through the storyline jumps, make old town a den of evil? if so its a crime ridden cesspool later in the game.
That being said both games have their issues, while being VERY user friendly, the combat system lacks the easy to use difficult to master aspects seen in many other 3rd person combat games (my biggest beef is how i can hack and slash with a sword for 8-10 hits on a guy or just stand back an unload my gun into his face and not get hit and avoid every attack by rolling away...or how magic is stupidly powerful)
Additionally the game has massive system resource issues, meaning, if i bloody install a game to my hard drive i expect it to run at least a LITTLE more smooth. This issue more than most really started to get on my nerves, it seemed randomly throughout the game my system would just drop to a snails speed, walking through town, fighting a pack of wolves, walking into a shop, it was never ever in the same place twice and that just seems like sloppy design. At least in Dragon Age Origins my system didnt gum up even tho the graphic quality was sad-tastic.
Finally the achievements, i know many people will say "thats not something a game should be held up against" but seriously making achievements that are UNOBTAINABLE without either a friend giving you items from multiple playthroughs or plodding through shuffling items from your characters to a friends then back to whatever character you need to collect your 40 unique weapons of which only 24 show up in each playthrough...this made me more angry than even my game bugging and not being able to advance the main storyline. I am a completionist and if the only way I can complete a game to 100% achievement is to either hope for the best intentions of random multiplayer individuals, or have a friend that has the game as well willing to burn up their own time to help me out. UGH
TLDR - Fable 2 was fun, Fable 3 was a grind, both could use some tweaking for sure.