As someone who came across the movie randomly and didn't even know there were games the movie was decent. At times it felt a bit thin and the movie really pushed the music in a way that scenes sometimes felt in place only to show off the music in the movie, which now makes sense knowing it was based of a game having to do with music. Some parts of the plot are very easy to see coming which is a bit disappointing and the cgi can be a bit clunky at times, however the movie is pretty good for what it is. I think ingeneral from what I've seen is that people who have never played the game found the movie to be much better than people who have played the game, so maybe if you have played the game your expectations should be that the movie isn't the best representation of the games and just watch it for the movie it is rather than a tie in to the game.