Just had a game today where nobody would shoot the Reaper. He just walked into the back of the team, I would call him out and nobody would do anything about him. Guy just strolled in, killed one or two people and then left over and over and over. If he got into any trouble, shadow form awaaaay. The only real counter to him is coordinated team play and that feels a little stupid, even in a team oriented game because of the huge difference it makes in commitment of resources and how difficult it sometimes is to actually coordinate people.
This is a VERY good note. Wish Blizzard could somehow see this. IMO Make a thread I think and just use this paragraph as your intro post, adjusted to make a decent opening post of course.