We've all been a victim to some coward hiding around a corner with a shotgun or some sniper who finds some weird vantage point to pick people off. It's a cheap, despicable exploit that ruins the gameplay. Yes, I am talking about campers. They ruin the game. But this is a problem that could easily be solved if bungie put waypoints above everybody's heads. That way nobody will get the drop on you because you will always know where they are. I remember the 1v1 playlist on halo 3 had a similar mechanic, but I'm surprised this hasn't been utilized more effectively.