Why not? You don't even need to win or do well. The bounties only offer legendary engrams. Not sure about the "unknown rewards" bounty. The quest requires 7 match completions. The shaders can drop regardless. I didn't have to win to get the emblem and shaders. I don't care about the ghost. All of the rewards I wanted, I got off of losses. When we won, we both got shit. We only won like twice I believe, so that's not saying much at all.