I personally never enjoy multiplayer and will mostly stick to single player even if a game provides multiplayer. The only 2 games that I've ever played multiplayer in are TF2 and Starcraft 2. TF2 because there is no such thing as single player in it, and Starcraft 2 because the single player campaign is only so long, and because it has a very good and strategically oriented multiplayer mode. I think that the prospect of working with someone else is very difficult. If I fuck up, I fuck up everyone else on my team, and that is just the type of pressure that I can't stand.