While not wanting to get into a lengthy argument, it is often said the had Stonewall Jackson been at Gettysburg, the outcome of the war would have have been different.
Yes, Lee did do some stupid things during the Civil War, but you don't become a General by doing nothing. Does Gambone examine why Lee named commander of the CSA Army? Or what his record was prior the WBtS?
Prior to joining the Confederacy, Lee was offered command of the Union army. Apparently, those in the South weren't the only ones who held him in high regard.