The book's central thesis is that Fed monetary policy made the depression worse. That is widely accepted by economists of all stripes.
However, Friedman also argues that the Fed should boldly step in as a lender of last resort. He ignores the fact that no institution can make a realistic solvency determination during a crisis. What that means in practice is he supports things like TARP.
This amounts to a statement that the cost of financial panics (which are an inherent characteristic of all systems with maturity transformation) should be born by the public rather than the financial sector. That is a political decision, not a technical economic one.
A lot of economics from the Friedman era is about clothing political choices in technical jargon.