"What do you say in response?"
I would say Opus Dei is not for everyone, and that people struggle with making life-long commitments. Any religious order will have people who have bad experiences. That's a part of life when you are taliking about institutions managed by human beings.
Same with the armed forces. My brother was pressured a lot to stay in the Navy and sign up for another stint. He didn't want to so he left when his tour was over.
A life in the Navy wasn't the right fit for my brother. But he doesn't go around saying bad things about the Navy.
No, Opus Dei is not for everyone. Unfortunately, Opus Dei does not allow those whom it wishes to recruit as numeraries to make an informed, free choice about this vocation. If Opus Dei were honest and up front about this unusual and very rigid type of religious vocation, that would be fine. But they aren't. They even deny that they are a religious order when numeraries clearly live as religious. Most religious orders do not want to admit people who do not have a real vocation to their kind of religious life. But Opus Dei does and it doesn't care what bad effects it has on the individual. They deceived and manipulated my son into thinking he had to become a numerary even though he did not want to live that kind of life. My son's only fault in all of this was in believing all of the BS that Opus Dei dishes out to its unsuspecting recruits. Thankfully, he came to his senses and left the order.