Would Truman rank higher if he didn't run in 1948?

[Sir Mohamed]

Harry S. Truman is always ranked among the best presidents. But I've noticed most of the accomplishments he's admired for happend in his first term (or the term he inherited from FDR). Handling of WWII, Marshall Plan, Berlin Air Lift, Desegregation of armed forces etc. all happend from 1945 to 1948. Other than formation of NATO and a few lukewarm legislative successes, his second term was overshadowed by Korea, the loss of China, corruption issues within the admin and the 1952 Steel Strike. He left office with a historic low approval number for any prez.

I'm curious about this question: What if he chose not to run 1948? Would he rank even higher? This would eliminate the negatives about his presidency, while accomplishments still count.