The critic has long been a reviled figure, at best the mere handmaiden of the "creative" arts, at worst a parasite upon them. For Brendan Behan, critics are like eunuchs in a harem. They know how it is done. They have seen it done every day. But they are unable to do it themselves. In an age of book clubs, celebrity endorsements and bloggers, what role is there now for the professional critic as an arbiter of artistic value? Are literature and the...