The best and worst big-screen performances of all time

What makes cinema acting great – or awful? As Harry Styles raises eyebrows in two new films, our film critics name the portrayals that really blew them awayHow terrible is Harry Styles in Don’t Worry Darling? Not very, sadly. Despite the lip-smacking about his reportedly awful performance, he turns out to be borderline competent – even quite cleverly cast – in Olivia Wilde’s drama, which is out this week.Still, fans of the formidably awkward can take comfort in his