No I have not. I am not surprised though. Content is endless, and shadow conntent is endless.
It sounds surprising, I think, because the Western, or perhaps popular view of spirituality is one of idealization. Focusing excessively on Light is as problematic as focusing excessively in Shadow.
I have a reprint of one of the mandalas to Vajrayogini on my personal altar. Most of the imagery and iconography will evoke the reaction you described. At the bottom is the most wrathful form of Vajrayogini, naked and all black with fangs, an intense, fiery aura, standing on a corpse. She holds a butchering knife in one hand, and a tantric staff (with three skulls) in the other. Various entrails being eaten by various animals. Yet the top one depicts a peaceful Vajrayogini, reposing in a meditational posture.
Both are Vajrayogini. What is not apparent is how any of this is an act of compassion. The middle Vajrayogini is red and she holds a cup made from severing the top of someone's skull. There is blood in it. How is _that_ an act of compassion? Isn't that just a depiction of evil and corruption? And Tibetan Buddhist will take this depiction as a yidam, ritually become this diety/Buddha. Why would anyone do that? Why do I have that on my altar?
Vajrayogini takes the most horrific karma and spiritual poisons and drinks it. She is called the trauma goddess for that reason. All the horror and abuses one might experience in this life and in past lived, she takes and drinks. And because she is a full Buddha, that karms burns and dies within her. In many ways, it is an extreme form of empathy, yet at the same time, the Buddha nature remains unstained.
Her two wrathful forms looks horrific because the pain and trauama she takes on are that horrific. That is why she is depicted in those wrathful forms. She enters fearlessly into your hell to give you the chance to awaken and to heal.
And this is why she is appealing to some people.
I have never set someone's broken bone or worked as an EMT or a nurse. Yet when I hear stories from them, it is like this. Giving care to the person even when really horrible things happen to them. I am not one of those Japanese cleaners who clean a houses after someone dies, or that Austrailian woman who clean hoarder's houses after they die. They clean away the pain, when no one else will do it. It is like that.
Are there abuses? Yup, there are. Is it excusable? No. And yet, there is a lor more going on than what is apparent.