If you're so smart (and if you were really honest), you wouldn't need me to.
But I will anyway.
1) Enlisted the help of bad men to fight men he perceived as worse men (i.e., Saddam and the Taliban among others).
2) Continued the pathetic charade that was the Cold War, including supporting the violent removal of democratically elected leaders in order to stem the growth of Communism (never mind that Communism was self-destructing on its own -- some victory).
3) Closed down many mental institutions. Next time you get harassed on the street by a schizophrenic panhandler, think of Reagan.
4) Almost singlehandedly created and fostered middle America's paranoia about welfare (leading to many cuts for people who legitimately need it) by telling fabricated anecdotes about welfare con artists.
5) Was an idiot in general. Ketchup is a vegetable in school lunches? Trees create more pollution than people do? WTF?