I agree with people like White Linen who have been saying that comments like "he was too ugly for her" are somewhat shallow.
BUT in this case, it is not about his looks, it is about his look. Whilst I admire creativity and expression, I have to try and understand where people like my parents are coming from when they find people who look like Marilyn Manson dreadful. People who are super tattooed (I am tattooed so I am not criticisng them -I am using it as an example) or pierced or take part in bodily mutilation are sending out signals that they embrace something that is societally 'other', unnaceptable or dark. And other is fine as long as it is positive or hopeful or about acceptance. But when the point is merely anarchy, I have no sympathy. I think people get rebellion and anarchy very confused. Rebellion is a subversion of the established system to get a better societal order. Anarchy is purely selfish because with such a nihilistic world view, one is impinging on the life of others. It is not particularly brave either because instead of making the best of things, one is making the worst of things. And from what I know of Marilyn Manson and his music, he is not a rebel, he is an anarchist.
So at the end of the day, how we choose to look (not how we were born looking) is a great insight into someone's personality. And yes, she is probably better off.
That said, she seems boring as hell. In her interviews she is very plank-like.