Granted, I'm done with the quest, but the biggest issue I've run into is people quitting games when they die a couple of times. When I was trying to get the 25 medals portion of the quest, I had a bunch of games where my team ended up being only 3 people. There's no penalty for quitting quick play, so I get why people do it, but it sucks for others that stick it out while trying to get their quest kills.
Yeah, it sucks. I left one only because my whole team left before me and I wasn't about to be farmed and lose progress.