Several times every game.
Zens charging sound from the left? → DM
Angry Japanese Bowman screaming from behind? → DM
Teammate calling out a Pharah trying to sneak above your team to ult? → DM
Hearing a Tracer zapping into your backline? → DM
All those scenarios will be much harder to pull off now, because most of the time you are not standing in a line between the attacker and his target.
Well, unfortunately it is on the front of the MEKA and not on it’s back.
So unless you are retreating or walking backwards the entire game that critbox will be pointing straight into the direction of the enemy team.