Years ago, I've made an online friend who says he's been in love with her since he was 10, when he first read the X-Men comics. He really means it (EDITED: it's the kind of innocent feeling of a child's heart that still lingers -- it's not the way an adult falls in love). It's adorable. :)
For us, she's a fictional character, but Jean is a real person for the other characters in the 616 universe. And I'm sure not everyone likes the kind of person she is. But I'd say most people do. On top of being drop-dead gorgeous, there's something so endearing about her and so many things that are so admirable... Seriously, she should be really hard not to love/fall-in-love-with or both. :)