Have a co-op firefight mode instead where a team must fight waves of enemies. Crucible is horrible, unbalanced and boring.
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Crucible is awesome. Fix the repeating maps and call it a day. It is unbalanced though. Much like every competitive pvp scenario, some players are inevitably better than others. RNG and marks/rep make this the most balanced pvp I've ever played. Remember that thing you usually get when you lose in other pvp games...?