This is indeed a huge factor. It also affects the games that you play and how long you play them. A few of my friends agree that CoD4 is better than WaW (who am I kidding? Most of them), yet most still play WaW because everyone else is.
I see this more with my 360 playing friends. Out of them, only one really plays football, he's the only one who plays for a team... and yet, when he picked up Fifa 09 so did all of the rest of 'em... I don't think they even knew the colours of the team's uniform that they were playing as.







