Please explain what you mean “it is not the ideal perfect person they envisioned for their child” is it that the parents don’t agree with the hashkafos or frumness or is it something like looks or family backround??? This makes a very big difference when discussing this topic!
Honestly, I don’t think it matters what the reason is. The child has to make decisions about their own life, independant of what their parents want for them. Granted, I do think the child should at the very least have an open dialogue with their parents and really listen, but the child has to make their own decision and live by it.
I know a woman who says she was forced into a marriage. She wasn’t sure before she got married, and she definitely had pressure. She thought it was wrong, but listened to everyone else. That was still her CHOICE though. She chose to go through with a marriage she didn’t think would work and got divorced within the first year. I had a discussion with my mother on whether that was bad mazal on her part or a decision. My mother thinks its bad mazal, but I disagree. She made the easier choice – she was worried about being thrown out of her family if she didn’t marry this guy. She didn’t have to marry him – no rabbi in the world would perform a ceremony for someone forced. She CHOSE to go through with it and no one bears the blame for her failed marriage but her (and her ex-husband). Did others put her in a tough position? Yes. Did they enable a situation where it was hard for her to say no? Absolutely. But it was her choice.