These guys aren’t really that nice. That’s the joke, I guess, but it’s hardly their fault. No-one’s particularly congenial in this 70s L. A. smogscape, where even the birds are giving up and dropping out of the sky. The Nice Guys, written and directed by Shane Black, Hollywood’s go-to guy for snappy, emotionally wounded buddy comedies, is smeared with the film-maker’s fingerprints. Ryan Gosling and Russell Crowe are a mismatched pair of low-level private investigators. There’s a dead wife, quipy banter, a lot of boozing, a stray Christmas jingle and at its centre two figures of bruised, broken masculinity, struggling…