Nonsense. Lee gets far too much credit for whipping the succession of mediocre/poor generals the Union threw at him the first two years of the war. Lee couldn't whip Meade at Gettysburg and made a spectacularly idiotic mistake known as Pickett's Charge. Lee couldn't whip Grant either even though Grant tried to help him out by sending human wave assalts into sure destruction at the Wilderness and Cold Harbor. The thing that made Grant different from previously unsuccessful Union generals is he wouldn't quit.
Lee was one of the last, and one of the greatest, of the post-Napoleanic/pre-modern generals. However, Grant and Sherman were the first of a new breed-the modern general. To them, war was not based on major battles, but rather an ongoing campaign used to grind down the enemey and destroy his will and ability to fight.
Lee never quite grasped that. If he had, he would have dug his army into a defense posture and worn the Union down until support for the war collapsed in the North.