One thing when I was doing Frontlines for ADS that used to annoy me, was that sometimes one team would just feed another team/throw it to another team, and our team would lose as a result.
For example, If I am adders coming 2nd place. Adders and Flames have around the same pts. But then Mael comes along, and hits adders when flames have 2+ nodes up and adders have 1 node. Adders now cannot fight flames as they are defending against mael and now adders lose, as flames are getting more pts from the 2 nodes up.

Another example of what can happen: Say, Adders and Flames have around the same pts, but mael is so terrible when they hit flames, that they just feed them more and more pts (since when you die, you lose pts, and the team that killed you gains pts).The mael keep dying to flames, flame's pts jump up, Flames now wins, and adders lose.

Another suckie scenario that I have seen: Sometimes it's mael and flames are 1st and 2nd, they'll just both hit adders, 2 teams vs 1 that is already losing, Adders would have no hope, they would have to defend against 2 teams, and it becomes a race from the other teams as to who can kill the most adders for the most pts. Not at all fair for the adders.

If it was just 1 team vs another team, you wouldn't have these problems, adding the 3rd team means that the better team might not win, depending on how the 3rd team plays. Too often I have seen "Mael is so stupid, now flames will get the win -.-" and visa versa when I am playing as adders. This shouldn't be a thing.