Oh yes, my best friend went out with a series of the most awful men (really to the point where you started wondering where on earth she found them all), and is now married to a lovely man.
Actually, I just typed that and then I thought, 'hang on, her DH actually did something which in some ways was bad as the rest of them'. But I think the difference was that her DH made a mistake but they loved each other enough that they kept working at the relationship even through very, very tough times, and that her DH's behaviour was a problem within himself, not with the relationship.
One thing I noticed was that she thought these 'bad boys' were glamorous, exciting, sexy, etc, while to those around her, they were tedious, stupid, self-absorbed bores. Her DH is not the world's most exciting man, but they hit it off from the start.
With my friend, I wondered whether it was a confidence thing in her earlier life - she felt that being with these tossers reflected well on her as it made her appear more glamourous than she felt. They appeared to have bags of confidence and some of it appeared to rub off on her.
What happened? Well, the last bloke treated her even worse than the rest (and they had been pretty bad), she had a another nervous breakdown, and then decided to stop seeing men. She took up a whole range of hobbies, made a lot of real friends of all ages, became genuinely independent and confident, volunteered to work with refugees abroad, and then, just before she went abroad, she met this lovely man at a friend's house. They stayed in touch while she volunteered and then got married on her return. So in her case, it wasn't the taste in men that changed, it was her levels of self-esteem, I think, and that then had massive effects across the rest of her life.