I think the game is definitely rigged. You can't watch the opponent's first 4 attacks with AI-like precision dismantle your board doing a 1 in 700 sequence of events several times and come to the "it's just random" conclusion.
It's clearly not always random.
Do they do this to shorten the games? To make the games more exciting?
So the important thing is to have Taunts to somewhat suppress the ability of the game to screw you.
Wait, what? In order for it to be rigged against you, it would need to be rigged FOR other players. BGs are a zero-sum play mode. If you're thinking "crap, those attacks sucked", your opponent is thinking "wow! Those were some lucky attacks".
Odds are odds. I've won 0.4% rounds and I've lost 99.6% rounds. Sometimes the randomness blesses you, sometimes it curses you.
It's like going to the casino, seeing that a roulette wheel has hit black 4 times in a row, throwing all your money on red and then yelling that the wheel is rigged when it hits black for a 5th time. It's not rigged, it's just how randomness works in the world.