Making a bounty to complete 20 waves of a 50 wave matchmade activity is just nasty. I am unable to complete the 50 waves due to one or both team mates leaving after 20 waves, guaranteed. Every single time. And no, I'm not using lfg for a basic hoarde mode matchmade activity.
Start putting some thought into these things.
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You do know if someone leaves they are replaced right? So there is no issue If it's legend yeah, that would be bad , but normal is the same has Vanguard Ops , really doesn't matter