Goodness, no. He's certainly magnetic and definitely needs to be shown love, but the rest of your life is a very long time to spend trapped in a basement with a homicidal psychopath. He would have given her anything she wanted, of course - as long as she never wanted to leave or see any other human being, and as long as she never withdrew from him emotionally, since he made very clear that he would take out both of them and whomever happened to be in the Opera above.
Tragic and compelling, yes. Deserving of sympathy, yes. Worth Christine consigning herself to a lifetime of fear... I don't think so. In the end, she did the only thing she really could have done. Chemistry is an important part of a relationship, but it doesn't cancel out physical danger and emotional abuse.