Don’t blame Maria Balshaw for Tate Modern’s failings. Its lack of ambition goes much deeper | Jonathan Jones

Tate stresses its departing director has ‘diversified’ the collection, but it has hidden its treasures and let its galleries slide into insulting incoherence – and visitors have voted with their absenceIn the last nine years Tate has had some hits, but its misses have become embarrassing. Tate Modern’s Turbine Hall is currently occupied by a feeble installation that would be weak in an ordinary-sized art space, let alone this gigantic one. It’s become genuinely hard