I didn't think anyone could top J. Carter...
Agreed. And Dubya.
Obama, as far as I am concerned, is merely an inefficient president, very good at BS'ing and image control, rather weak and wavering at foreign policy, populist in domestic policy, eager to leave a mark even if it means screwing up the citizens (Obamacare; to be fair, it was the Republicans that twisted the law so badly it became very obviously non-workable - but Obama pushed it through nevertheless).
Bush, unfortunately, was a very efficient president. He almost succeeded in destroying the economy and bankrupting the country. He got us into the never ending Iraq fiasco. He actually started with a very good plan - defeat Iraqi army, depose Saddam, disband the Republican Guard, keep Iraqi Armed Forces to maintain law & order, fix infrastructure, install a friendly government, leave. Then, after the initial success, he's fired the guy in charge of that plan, disbanded the Iraqi Army (sending over 300K young angry trained men home where there was nothing waiting for them), and sat there whistling while Iraq was disintegrating without running water, electricity, and any semblance of normal life. Now we have that eternal problem pit that will be sucking American money and lives of Americans and Iraqis for decades.
And don't forget his crown achievement, the Great Recession. Only brain dead die hard Republicans still believe that some obscure law adopted under Clinton, which was never really enforced, caused the Toxic Mortgage crisis 10 years later / 8 years after Slick Billy left the office holding his pants and handed the keys to Dubya.. No sir, it was Greed, pure and simple. The SEC started allowing the mortgages to be repackaged and sold as securities (happened under Dubya), the financial institutions quickly realized that a bad mortgage could be resold for the same amount as the good one, since the investors didn't know any better, and starting around 2005 they began issuing these mortgages right, left and center (again, started under Dubya). There were strict industry rules meant to ensure that the person getting the mortgage can repay it; these rules were still enforced in 2000, and in 2001, and in 2002 - but went out the window in 2005. Sorry, Clinton had nothing to do with this. The bubble by it's very nature was very short lived and blew up just 3 years later, also under Dubya. The SEC was very careful to look the other way. There were economists, most notably Roubini, who warned about the impending crash; nobody listened. So, while both the Dems and the Repubs did zero, nothing to stop the craze, it was Dubya who ran the country. So that's his mess.
As far as I am concerned, him and Carter should share the 1st place, with Nixon and O'bummer taking the 2nd and the 3rd, in no particular order/