Silveradept, in comments, asked for links to a study or report ranking post-WWII U.S. presidents that would bear out the list posted below. I asked John at Progressive Involvement who said he posted an email he received and had no links to share. I did a little digging and found the tables below.
According to Forbes, Bill Clinton ranks first among the 10 postwar presidents overall, with LBJ and JFK in the top three, but Ronald Reagan is ranked above both Truman and Carter.
The US Misery Index says Eisenhower presided over a less miserable country than the other nine.