Oh, don't even get me started on that. Earlier I had a game where we were in a stalemate with the enemy team; neither wanting to move up and neither wanting to fall back. Naturally when the announcement for heavy ammo came my team flocked to it, - it made sense, since we were closer - but I stayed to prevent the other team from picking us off while our backs were turned. The instant heavy ammo spawned, it was gone. Few other things in Crucible make me quite so upset.