Mary-Jane has the advantage of being Spidey's Girl. Which brings us to two possibilities. One, you are Spider-Man and she's your girl, in which case she's perfect and no one could be better suited for you. Or, by some miracle of quantum mechanics, Mary-Jane is attracted to you instead of Spider-Man, in which case she's the girl who got the nod over Black Cat, Gwen Stacy, et al. So you get the great sex, the tireless support, the supermodel/acting career pay, kinky web-based fetish play, and assorted benefits.

Spider-Man Girlfriend Status clearly > British accent.