A critical consensus forms and then is eventually replaced by a new one. What matters in the end is whether you are moved by something or not – it’s the only mark of quality that you can be sure of. To argue for the binning of established canons to make way for the lionisation of, say, Dumb and Dumber and 90210 would be absurd, yet it is just as daft to deny that “low” culture can have a powerful, and therefore equally valid, effect on us.