Calling McKinley a bad president, let alone one of the worst, is complete & utter bull.
I guess it depends on how someone considers a president one of the "worst".
For me I ignore the ideological viewpoints and go more with how "successful" the said President was. I believe that most people in their right mind would conclude that Presidents like Tyler, Pierce, Buchanan, Andrew Johnson, and Hoover were utter failures in their tenures.
Some people on here seem to take a little more subjective of an approach.
So yeah, by my definition calling McKinely, whose politics I despise by the way, one of our worst presidents is a little crazy.