I encourage you to look at the roster while the game is loading. See if the roster team has a 4+ person fireteam. If so, go into the pause menu and see if you're about to be pubstomped.
Then go into the menu and go into settings-> change character.
Repeat until you find a balanced game instead of medical waste.
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simple don't play iron banner its pointless waste of time and due to the poor matchmaking one sided games. as a single player your almost always on the losing team when match against 4 plus fireteams. Bungie well done again