Personally, I've always enjoyed it when theres some resistance or opposition to overcome. I mean for all practical purposes, it would be just as fun to create a private arena, get 10-15 guys to enter and come to one side, and then strafe down field ack for hours on end.
Or for variety's sake, you could take turns being the 2-3 enemies you meet, and then quickly overwhelm before an actual fight ensues.