Nothing to do with desire/how good the game is.
Once I'm recovered and back to work, I've only got about 2 hours a day of free time to myself where game playing is an option (maybe a bit more if the kids go to bed early and/or I don't mind mising out on my own sleep) . That time also includes any TV I want to watch, fantasy football planning, and the trivial detail of actually interacting with my wife.
Weekends I'm generally doing stuff with the kids, so locking myslef in a room all day to play computer games is heavily frowned upon
Some of the time that used to be taken up by actually playing sport is about to free itself up at least.
and lastly, if O do find mself with enough time to spend a few hours a week on the X-box - its going to be with FIFA/PES first, before Fallout.