Watching a game is very much like making love to a beautiful woman...no, wait, no it isn't. I think the quality of a game affects how watchable it is, and the type of game. It's obviously a lot more fun to watch a cinematic, story driven game such as Final Fantasy, but probably a complete bore to watch someone play Everquest for hours on end. Really it depends a lot on what's being played and what's being done at the time.