The goal of the game mode is to win, if the game gives you multiple viable options to accomplish that goal any of them are valid options to choose, one is not more right or correct then the others. It may not be your personal preference, but all valid options are in fact playing the mode.

When parties or alliances are getting decimated by a party with battle high it's generally not because of the battle high itself, but rather because they don't focus targets, don't focus the the correct targets (like trying to take down battle high targets while 3 healers are right there completely untouched spamming heals on them), not using CC, choosing poor times and places to engage the enemy with battle high and so on. It is completely possible to deal with if your team is using common sense and coordinating with each other.