Daniel Kibbe’s review published on Letterboxd:
A charming little film, that's a bit too aimless at times. Gerwig is great, as I expected, and the film's mood makes for a pleasent experience. It delves into "whiny" territory a bit too often, and it doesn't have a lot to say; but it's an enjoyable watch.
I'd also assume someone's enjoyment of the film also stems from how much they relate to the main character. So, some of the vastly different opinions seem reasonable.