Bush's tax cuts prevented the worldwide Oct 2000/Mar 2001 recession from becoming the Great Depression II after Sept 11th--a trillion dollar attack on our economy.
For that reason alone, Bush deserves massive credit.
There are so many variables its impossible to be so certain if the depression would have gotten worse or better due to the tax cuts.
Is the recovery in spite of Bush's economic policy or because of it? Someone who advocates Kerry's "middle-class tax cuts" view might say that cutting taxes helped but he could have done so much more by cutting it for the right people.