I have no favorite, Ken. Most did something bad that I believe negatively affected the country. Like we say when reading point slips at an HRC ribbon award, "in no particular order"...
JFK; Vietnam. Bay of Pigs, U-2,
LBJ; The gulf of Tonkin. Vietnam in general.
Nixon; Dishonered the office, ie, Watergate. Opened China
Ford; Pardoned Nixon.
Carter; Peanuts and Billy beer... Established relations with China.
Reagan; Trickle down Reaganomics, which still haunts us. Iran-Contra.
Bush 1; "read my lips".
Clinton; That cigar thing
"W" Two failed wars.
Obama; OMG he's black!
So, I guess I'm only left to "Like Ike" in the Presidents in my lifetime, and that seems to so many here the time we would like to go back to. But it's not likely to be.