Nobody hates 31's. It is just that each 31 that a fire team takes on, is a handicap. Now before anyone starts in with the quality of the player argument, let me say that being 2 levels below the enemy instead of 1 is a huge handicap. No matter how you slice it, they do significantly less damage, and take significantly more. So even if you are the most skilled player on you fire team, if you are a 31, you have to be a whole lot better than any 32. If I know a player is skilled and is only a 31, I would take them in a hard raid. But I wouldn't think about taking more than 2, and I would only do that if I knew the players from past raids. If you are a random, and you are a 31, too bad.