Yes, he was a good President. Mainly, he acted Presidential and sounded Presidential. Granted, he pulled some bonehead socialist and political stunts, but all Presidents do something that makes them look like ordinary people from time to time. In his day he rallied the people to save America, which was not in actual imminent danger of destruction but still in some trouble, and so was in the spirit of Lincoln before and Reagan after.
One of the greats? Sort of, but more because of circumstance.
I am reading FDR's Folly right now. Just into the first four chapters. Read that and then tell me he was a good president. The US was still in a depression Dec 7, 1941. His policies and behavior was worse than Carter's and he allowed tons of Soviets spies to infiltrate our government. He was a disaster.