I know none of those games are really that long or terribly hard, save a few, it's just when I think about sitting down and finishing off Fallout 3 I say to myself, I don't want to do that. Same with like every other game. I'd much rather jump online and play a game of hockey or a few rounds of CoD4. I really wish I didn't spend all that money on those games....
Oh and add Left 4 Dead to my list.