One of the interesting aspects to me is precisely what annoys you: the notion of true/instant love. Yes, many romance novels ostensibly use that trope, but it’s significantly more complicated and layered in the play (I think). Shakespeare is toying with the idea—common then—of unrequited love, but he is layering on that the notions of social divisions, the play of fate (another thing many more people understood literally then, particularly in the form of astrology)…and I think he’s questioning the very assumptions made by the characters about those things: Romeo and Juliet’s romantic attachment to an ideal that Shakespeare very much questions might be the *real* fate…there’s a lot going on in R&J, something I’m only lately really realizing.