The ratings would indicate, that this movie is mostly comparable to a painful feedback noise. However, that is not quite the case.
The first third is quite enjoyable, especially compared to its contemporaries trying to exploit the same genre. Unfortunately, while ratings are not caused solely by poor film making or subpar acting, points are missing because the film itself is lacking a strong story.
The best part of the film is its theatrical trailer, which doubles as a kind message for audience to silence their mobile phones. The trailer, obviously, is missing but so is its captivating setup: the band about to start a sold-out gig on a large stadium. None of the magic, that was present in that single, brief scene, exists in the full length release itself.
There is very little about the band, the history, reunion or music. The band could be replaced by any similar setup, where a group of people hit success and suddenly story fast forwards fifteen years. However, the road to success itself is not told and everything begins when the golden years have already passed by a long margin.
In place of any truly interesting elements there is only a bland and much too common story about a couple of old friends, who have either lost it, are losing it, or have managed to stay on top of things by abandoning their previous lifestyle.
As there are too few highlights that would hide the long shadows the too beat up story casts, the initial excitement wears off. By the time end credits are queued in, any special magic that could have been there, has truly disappeared.
Not a bad movie, but there are better alternatives depicting both fictional and non-fictional music ensembles and the people around them.