Comparing Grant to Hood is appropriate and interesting if you know anything about the US Civil from a tactical point of view. Grant and Hood were tactical soul mates.
Not even close. Grants campaign at Vicksburg is a text book example of original thinking. He outsmarted Lee crossing the James. Hood by the time he was given command of the AOT had already lost a leg, had an arm shattered and probably was probably on drugs for the pain. From a tactical point of view, Cold Harbor was a failure, Grand said so in his memoirs, Lee never admitted a mistake for the thousands of Confederate soldiers lives he threw away attacking up Malvern Hill or Cemetery Ridge. Both assaults up hill, against an enemy waiting for the attack and backed up by massive artillery support. As a matter of fact, at Malvern hill, Union infantry watched their artillery slaughter Lee’s troops and most didn’t even have to fire their rifle muskets during the battle.