Depends. In btb I play better with friends. In swat, team slayer, or multi-team i play better alone. For some reason I become so much more frustrated with the lag when i have an audience, and that really affects my playing. Plus since none have an optimal connection, we lag our selves to death. But its not jearly as bad as when im just by my self.
But i do often like playing more when i have a beer next to me.