I'm not sure how to feel about this movie.
It's depressing. From what I understand, it's about unrealized dreams. Muriel is an outsider who longs to be accepted. Her only dream is to get married. In order to separate the ties that bind her and begin her life as a "new" person, she steals from her family and moves out of her hometown. Then she makes a friend who turns out to have cancer and, tragically, becomes paraplegic. Muriel eventually achieves her dream of getting married by finding herself in an arranged marriage, but even this is just a compromise because there is absolutely no love between them (did anyone else get the impression that David was gay?). Then Muriel's mother dies, seemingly after an embarrassingly painful shoplifting incident at the store, which forces Muriel to rethink her mortality and get her priorities in order. She then goes back and "rescues" her friend. But unless the two become lesbian lovers at the end, this is not a happy ending. Muriel never achieved anything. She did get her "wedding" out of the way, but she still hasn't truly found happiness, or really any purpose. Where does she go from there?
I think the movie's good on a lot of levels (the acting), and I'm completely aware this is not a "feel good" comedy, but it's actually just an incredibly depressing drama in disguise. Like I mentioned, I'm not sure how to feel.