The Obama administration didn't ignore a PDB that warned about what would become 9/11; it didn't engage in a necessary war (Afghanistan) while ignoring Afghan history  (Brits and Soviets); it didn't start a lie based war which included a total lack of  knowledge about the Sunni/Shia divide in Iraq and the Shia majorities in both Iraq and Iran thereby laying the basis for ISIS  - while "paying for it off budget"; it didn't cause the Great Recession.
Obama said some dumb things. He was personally scandal free. 
The Republic party has foisted Bush 43 and Trump on our country. Trump's Twitter derangement and his bloviating narcissism are the biggest threat to our country since the Civil War.