I think it's worth remembering that almost everything that's known about Vivian Maier is the result of a carefully assembled narrative crafted by a single individual. That story, about a mysterious eccentric woman who documented everyday Chicago life from the 1950s/1960s with camera in hand, was revealed to the public in the form of a movie and book(s?). I imagine both were instrumental in driving print sales.
Maier was a good photographer. But for me, with a handful of exceptions, there's not much there beyond nostalgia. Not that nostalgic charm is an unworthy aspect - I love looking at old photographs of large cities, especially from the first half of the 20th century. But, beyond that, there's little that stirs my imagination or draws me in for a deeper look and consideration.