Actually, the news item is that nearly 99% of historians in a survey see the Bush presidency to have failed.
But anyone will tell you that the vast majority of professional historians have a very liberal and partisan political outlook. So of course they look down their noses at President Bush. It was the same situation in 1960, don't forget--then too, most historians were liberals, and when surveys were taken that year, the vast majority of them believed the presidency of Dwight Eisenhower, a Republican, was a failure. A failure! And today, Ike is ranked as one of this country's best presidents.
So don't take these partisan views too seriously.