hehe... during the Shadow of Mystara years, we had ways of dealing with scrubs who jumped into a game at the wrong time. You couldn't hurt them directly, mind you, but there were ways. A thrown treasure chest here. Reactivate a trap there. Hide in the corner and let them go 1 on 1 against a boss. And don't get me started on what a cleric could do with a well-timed striking spell. <img src="graemlins/glee.gif" border="0" alt="[Glee]" />
Back to the topic, vs games and especially fighters are the best, they bring the challenge to a level that coop games either can't reach or have to sacrifice the fun factor to reach.