Who am I kidding? She was never good to begin with, and here's why.
Vincent Berserker is one of the most popular champion unit and yet, freya berserker can hardly be found in the top tier teams. Makes one wonder why top tier teams completely shy away from her, while rampantly abusing vincent berserker like no tomorrow.
One of the reasons is her incredibly underwhelming (compared to vincent's) aura, which has a 30% chance of trigger teammates to attack with 75% atk and stun for 1 turn. On paper, it would seem like a decent ability but in practice, it is alarmingly ineffective and counter-intuitive. Upon testing with my freya berserker, it has a 1 in 3 chance (roughly) of triggering 1 teammate (each has a 30% chance of attacking; not a 30% chance to trigger all 3 in aura) to attack the enemy who attacked freya. This would mean the enemy who has already attacked freya gets stunned for 1 turn, making it a completely useless disable, not to mention the incredibly low activation chance. Comparatively, vincent berserker reliably (75%) boosts his own ATK and that of his teammates by 25%, allowing him to out-damage freya berserker and become the hardest hitting hero in this entire game. Even on its own, Freya's passive aura is underwhelming even when compared to other regular non-valiant units, making it one of the lousier auras despite being a valiant.
Secondly, her skill lowers her DEF by an astounding 30% while her vincent counterpart loses 20% of his HP. With the decent buff to the DEF stat, this DEF debuff to her hurts so much more than vincent's self-harm debuff.
Hence, I suggest reworking freya berserker's passive aura (e.g. when others in her aura get attacked, she attacks, which fits her "gung-ho" image, or boost herself and teammates' ATK but guaranteed), as well as her skill's self-debuff (removed, or at least match vincent's HP self-damage but 15%) to increase her exceedingly underwhelming viability in PVP.
TLDR: Both of Freya's Aura and Skill's self-debuff are worse than that of Vincent's; please give her some love and have them reworked.