I've read a lot of negative post about this week's Iron Banner but I thought Supremacy was a great choice. The key to Supremacy is working as a team to get crest which benefits those who combine firepower. Even in games where I wasn't part of a fireteam, I would stick with a group and run through together. I was able to get all three Characters to rank 5 and got some great loot drops. Just have to be patient and have fun.