Bush usually shows up on the list of worsts, but it's too early to tell. Truman and Reagan, for example, were not well-regarded by historians immediately after their administrations, but have looked better in the hindsight of history.
And in the case of Reagan, the hindsight is wrong.
He and his follower GWB created the national debt that we have today.
He instituted trickle-down economics by deceiving people, and its legacy is our great recession and our huge inequality and social immobility. He is responsible for our current polarization because Republicans worship him and his stupid, crippling ideas.
His was the most corrupt administration in history, with scandals in many of his cabinet departments.
He sent weapons to Iran and used the proceeds to fund terrorists in central america, as well as selling drugs to fund them.
He waged horrible surrogate wars of terror with deathsquads in central america for no purpose, wasting our time and money.
He left 241 marines to die as sitting ducks in Lebanon, and waged a stupid war in Greneda to divert attention.
He wasted billions on useless military weapons.
His deregulations resulted in junk bond and S&L scandals and increasing levels of pollution and workplace accidents. He delayed solar energy by decades, causing global warming.
He started the trend against unions.
He gets credit for an economic boom, when in fact it was only a boom for the wealthy (no-one else benefitted), and also prolonged and deepened the recession he inherited, expanding homelessness.
He gets credit for ending the Cold War, when the Soviets merely imploded on their own.
I do give him credit for negotiating with Gorbachev when the opportunity came, and for eloquently asking him to tear down the wall. His tax reform was not bad. So, he's not
last on my list then.