I don't think the problem with leeches, or even dead weight players is exclusive to Frontlines. These people are in Savage, EX, all the other PvE roulettes. Being dead weight, and wanting to be carried through content without putting in the effort. They've no interest in improving themselves, I don't lump sprouts in with said Dead weight. I wish it were easier to just kick these defeatist losers out on grounds of deliberate griefing, but unfortunately you have to convince a team full of these people to do it.