The film fits Joy Division's music perfectly. It is beautifully shot in monochrome, the two leads are superb and the attention to period detail is meticulous. Actual Macclesfield locations are used - particularly the house on Barton Street.
Like most people, I only saw Joy Division via the handful of film clips that exist. The live scenes in the film look totally convincing and Sam Riley captures Curtis's manic, twitching intensity perfectly.
As it ostensibly deals with the breakdown and suicide of a confused young man, don't expect many laughs - though the blunt, wisecracking Rob Gretton character provides much needed light relief. Neither is it a cliched band biopic as it is more concerned with the more mundane kitchen sink drama of a failing relationship.
Joy Division spods can have fun spotting factual errors (e.g. they didn't do the song Transmission for Granada TV), but if you accept that sometimes facts need to be compressed to fit a film, this is fairly faithful to the true events (and yes, Ian did have a donkey jacket with HATE on the back).
Nobody really knows why Ian Curtis killed himself, but the contributing factors are lined up like suspects in a murder case - prescription drugs, infidelity, career pressure, debilitating illness, etc. It doesn't touch upon Deborah Curtis's scary assertion in her biography that Ian might have planned it all along. Best not go there.
If you have any attachment to the band, this is required viewing (and I doubt if you've waited for the DVD). It's the necessary counter-balance to the hedonism of 24 Hour Party people and more in keeping with with the bleak, northern soul of Joy Division's music.