This movie excells at presenting charming trash characters and offers a unique premise and overall presentation that is both depressingly bleak and at the same time very colourful and goofy. Especially the two brothers are wellcasted and played, some smaller roles are lacking though. For a movie like this, I feel like the music could have been more vibrant and attention grabbing. I imagine some punk bands would fit well, which is a rare opportunity for a movie.
Anyway, the biggest flaw of the movie is the lack of a overall drive/motivation. Yes, technically there is motivation for every scene, but it's just not a lot. The side plot actually has more power than the main plot. This is especially the case in the second act where the movie drags a bit.
Overall this was a nice experience simply because it was refreshing, but it won't be a movie that is going to reach cult status or any big numbers.