Well he has done alot to fix the economy every since the U.S Housing bubble burst and entered a recession. The Iraq war.....
I think he has very much hurt the economy more then he helped it after the housing bubble burst. His "stimulus" did nothing more then put taxpayers further into debt. His social programs gave people more incentives to not work, slowing down economic growth.
Withdrawing from Iraq allowed the ISIS to take over much of Iraq and will end up costing us a lot more then if we had stayed there.