I have to say, if I pick up a book and open to a prologue it is an immediate turn off for me.
I did write one, a short one. It showed my pregnant heroine at 16 in her father's office. He gave her an ultimatum once the baby was born. She decided then to give the child up for adoption.
Then chapter one starts with her moving to a different state, away from her father and forgetting about the child she gave up and the man she loved whom her father kept her from.
But after writing the entire story, I decided to cut the prologue and filter the information in through dialogue with the hero. He learns, as well as the reader, that her choice was to give the child up for adoption, or have the hero go to jail for raping her because she was 16. Hmmm... what's a girl to do. She was in love with this guy. So she gave her father what he wanted.
It reads so much better and I'm glad I made the change.
Do you write prologues? Tell us about it.