Whenever I played Halo and went on a killing spree in multiplayer, nothing killed my buzz like a random teammate splattering with a ghost…
Edit: Personally as long as they balance it out, I'd like to see it in PvP
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I prefer FPS games with friendly fire because it means you have to think about what you're doing. Can't just throw random grenades and rockets about the place, might kill a team-mate. But if it's not included it wouldn't be game breaking or anything...