That's only reasonable for people who like finishing games as fast as possible and think that that's a virtue, confused1. On the other hand, many people (myself included) like to take as long as possible to finish a game, explore every area, do every quest etc. That's just as valid. Different people play games different ways and, in fact, I can imagine game developers becoming frustrated if no-one ever bothers to do any of the little wrinkles, quests etc that they've taken so much care to work out and put into the game.
Edit: in fact, the best way to finish the game as fast as possible is to get a walkthough or guide and follow that, ignoring all side quests. I think most people here would agree that's the worst way to play a game. Having said that, though, there are some people here who seem to want just that...
