Why is it open season on Macquarie?

Macquarie has long been lauded as Australia's top investment bank and one of its leading companies, with outstanding earnings growth. But the one-time market darling has taken a battering recently, with a 50% drop in its share price and a spate of questions about the viability of its business model. Is it flawed, or is Macquarie just coming down to earth with a bump? By Fiona Haddock.