There's a VERY interesting chart on Wikipedia (at http://en.wikipedia.org/wiki/Histori..._United_States )

What's really interesting is that it show NUMEROUS rankings of the President - starting with the Schlesinger 1948 poll and then adds a column for the 'aggregate' ranking.

In the aggregate - the averaging of the polls, the following Presidents are rated 'in red', as in the 'least best' ranking (Lincoln, FDR and Washington are ranked 1-2-3):

33 - Benjamin Harrison
34 - George W. Bush (GHWB came in at 22nd, tied with Taft)
35 - Taylor
36 - Tyler
37 - Grant
38 - William Henry Harrison & Fillmore (tie)
40 - Pierce
41 - Andrew Johnson
42 - Buchanan
43 - Harding

Interestingly, Nixon was consistently "in the red group" as worst ever until recently and now his average ranked 32nd.

Carter came in at 27th.