The advent of instant, online consumer appraisals of everything from live shows to music, books, hotels and restaurants has transformed the review process.

Today guest editor Stewart Lee, who often uses some of his worst reviews in his publicity material, debates whether professional reviewers still have anything to give with Kate Copstick, chief comedy reviewer for The Scotsman who is a regular judge at the Edinburgh Fringe and Matt Trueman, a theatre blogger and critic who writes the Guardian's Noises Off round-up of theatre blogs.

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