Frontline is Hot garbage.

[Mayhemmer]

Winning in frontlines just amounts to whether or not your team will throw the match straight out of the gate.

Or, more often, whether or not one of the other two teams throws their braincells into a river and just bum-rushes your team the entire match, oblivious to the fact that they're in third or second and completely ignoring first place. It happens so, so, so often in my experience. The whole adherence to the 3-team design (is one of the many design philosophies that) needs to be axed; more often than not, people just find it frustrating.

[Nikoto]

So true. Make Rival Wings the new roulette.

[Lyreia]

This is not a casual thing, this is a kind of grief that ensure that the match ends quickly. Most people really don’t care about the outcoming of the match, since this perfect game tends to reward mediocrity, so they just go blocking the other losing team so they won’t “disturb” the winning one.
Despicable and a shame, but you can thanks devs for this, since they let the losers still get their exp and rewards.