You realize Herbert Hoover was to the left of Theodore Roosevelt, right? Almost the entire "New" Deal was based off Hoover's proposals.
He was a disaster. That's all I care about.
I think you're oversimplifying it. To a large extent, he was in the wrong place at the wrong time, and while he probably had the right personality and leadership style to preside over prosperity, he had the wrong personality and leadership style to lead a country through a disaster.
I think presidents get too much blame, and too much credit, as the case may be, for what happens economically during their presidency. A president's effect on the economy is more subtle, and more over the long run than the short run, in my opinion.
I believe that while Roosevelt's policies took the hard edge off the depression through various relief and stimulus programs, his anti-business approach prolonged the depression and prevented a longer term cure of the problem.
Roosevelt was forced to reverse many of his anti-business policies in 1940 in order to induce companies to invest in productive capacity for war materials, and it is really from these new policies that the post-war prosperity was born.