I don't know what people expected but I really don't understand why there is so much hate towards this movie. It was exactly what I wanted it to be.
The lead character Joanne is an extraverted, outspoken person who says and does whatever she wants. She makes people uncomfortable trom time to time and that's what makes her real. She doesn't have her life even remotely figured out.
The movie shows life exactly as it is. Improvisation is the point of the whole thing. There are no great lines, suprising twists or love at first sight. It's everyday events that lead to people forming bonds with each other .
I think the movie is great and you should give it a try.