>As far as who was the worst... I'd have to say that in the modern era no president left a country in worse shape, compared to the way he found it, than W did. (Herbert Hoover might have but I haven't gone back that far.)
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>For the best turnaround, FDR is a slam dunk and Reagan and Clinton tie for second.

I agree that W was bad. I'll also say that Obama will be recognized as just as bad.

I disagree on FDR. The turnaround is more due to WW II and afterwards. There's a growing consensus that FDR prolonged the depression.

Reagan benefited from circumstances. (He certainly wasn't a bad president.)