[Ygorl]

Yeah, that's most of what I was referring to about people getting frustrated. From my (admittedly limited) experience, that kind of thing happens more often when experience or skill levels are vastly different than it does when motivation levels are really different, though (by motivation, I mean motivation to win, not motivation to play, a lack of which is possibly the worst possible trait in a player).
But yes, I completely agree, it can really screw up a game when essentially people aren't even *playing* the same game.