They had a mode like that, its was called Rift and my whole clan loved it and pretty much won every game we played, but anyone we versed would try and spawn kill you at the spark farming kills while they hang back and not die, only to end up whingeing that they didnt win even though they had 2/3x the kills even though the aim of the game is to take the spark and ignite the enemy rift and you win after 2-3 rift ignites... i think bungie needs to have a report function for those that dont play the objectives in crucible, so sick of losing games because other teammates are more interested in building their KD than winning the match... so many times in control ill see the top player have double kills of everyone else and not a single capture, players like that should be banned from crucible because they refuse to play as a team.