When the other team is 2.0+ KD and your team is all negative, the matchmaking is completely broken. Either make the sbmm matchmaking better or get rid of it. It's lazy and it shows how little effort Bungie puts into the crucible
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Bungie basically got rid of sbmm long ago and are just using sbmm as a name. The system is basically lose 5 matches in a row and it'll activate a light sbmm for about 1 match. Till then it's basically just trying to find anyone.