Apart from the lead performance, the best thing I can say to commend Sex & Drugs & Rock & Roll is that it leads you to want to listen to more of Ian Dury's music, which is no bad thing at all.
Try to ignore the clumsy sub-plot with the increasingly ubiquitous Bill Milner's fear of swimming which references Dury's water-borne polio infection and his later struggles to accept maturity and responsibility and enjoy the film for what it is. A pretty good biopic.