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To answer your question, today, I've been romantically involved with someone for almost a year now, a person I love very much and will hopefully be living with by the end of this year. Still, I don't think La La Land is not a great film.
Make no mistake about it, La La Land is beautifully shot, comprised of decent performances, but it also had a generic premise and I didn't find the music to be all that great or memorable. It was a solid film, but I don't share the sentiment of a lot of others, it isn't because I'll ill-equipped to enjoy it, I just simply didn't love it.
Oh, and for the person that said "people who don't like it, just don't like musicals!"
If someone doesn't like something, that doesn't give you the right to put them in a box for it. This method of thinking is overly simplified and narrow-minded. "Everyone that doesn't like Star Wars, just doesn't like science-fiction!"