Gold standard is stupid, its utilization inevitably leads to a complete stop of the economy whenever a crisis hits - the mechanism is simple: if the economy slows down i.e. demand falls, then given that a currency is backed by gold at a fixed rate, the purchasing power of this currency will rise.
Thus, people will hoard the currency resp. gold, causing a downward spiral in demand patterns and ultimately a collapse in the economy. When such a scenario comes true, or there are clear signs of its realization in the near future, government will likely debase the currency - whose gold backing becomes meaningless.

The objection made by gold standard fanatics is: with a gold standard there will be no fall in demand, since there will be no monetary manipulation by the side of central banks and no boom-bust cycle. Looking at the evidence from the past, I don't think this is true at all.