You take what a prez wanted to do and then you look at what he did do.
Otherwise, "history remembers" everything in as many ways as there are rememberers.
Personally, given my values, I think Reagan was a disaster and really a kind of pathetic figurhead who presided over a rightwing takeover of the country, Bush Sr a well-meaning nobody who gets a C+ from me, Clinton an enormous disappointment.
I am almost certain that this president will lose next year and - unless the middle east problems somehow get better in the next few years - be remembered as one of the worst presidents in recent memory. The mirror, not the opposite, of Carter. His "success" during post-9/11 is a total fiction...any president would have looked at least ok.