Seriously i -blam!-ing hate random matchmaking 6th time looking for people to do the weekly with and all they do is hide in the back waiting for me to carry them and do all the work i seriously just leave!!!!! Please bungie whatever u do dont put random matchmaking in raids it will literally kill one of the few last and best elements it has!!!!
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I have mostly had a very good experience with matchmaking on weekly strikes unfortunately you will always get the odd lazy person that just wants the reward for little or no effort. I just leave them alone and start again.