Albert Castel, "Hooker, Joseph," American National Biography Online, February 2000, http://www.anb.org/articles/05/05-00359.html.
As to Hooker's military abilities, two conclusions would seem to be justified. First, he had few equals and perhaps no superior among Union generals as commander of a corps or any force he could personally supervise and inspire. Second, he was deficient, as revealed at Chancellorsville, in those qualities of mind and temperament needed to lead a large army in a successful offensive campaign against a foe as redoubtable as Lee and his Army of Northern Virginia. But, then, the only northern general who ever did so was Grant, and it took him a year and 100,000 casualties to do it. Thus it is quite possible that if Hooker had gone against any Confederate army commander other than Lee, he would have garnered the glory he sought. His failure at Chancellorsville basically was his own fault, but it also can be said that he was unfortunate in his opponent.