This is a question better saved for historians... Did GWB leave a bigger mess for BHO than BHO left for Romney? It will be a no brainer. But for now, focus on replacing BHO.
The prescription drug program, an unfund liability of $7.2 trillion, was one of Bush's biggest mistakes. Karl Rove was the "mastermind" by this as a way to preempt the Dems on their traditional issues. And same holds true with his No Child Left Behind, another expansion of federal power and funding.