I would rate it in between 5.6-6.5. It's a one time watch movie. Acting is the only one thing which keeps interest (Change the actors and i bet movie would be around 3.5-4.1imdb). The story is not too unique or too deep. It doesn't showcase how fame and glory changes environment and new people around new star and how this changes everything. As a musician, i notice that last song in the movie was written to be performed probably for Beoyonce (way too high notes for Gaga) with the lyrics probably written by some teenager from mediocre collage (imho even English is not my first language).