Agree with Weeball, I think it depends very much on both the genre and the game and the type of game you like. Some games are developed with single-player very much in mind (e.g. Half-life 2), while others such as the Battlefield series are the opposite. I've been a PC gamer since 1990, but only bothered to play online seriously when I bought GTR2 for the PC. I'll probably play Forza 2 online when it comes out on the 360, but couldn't be bothered with the likes of GRAW2 (due to a lack of success!)