[Took me a minute to realize you were referring to Robert E. Lee.]
If you accept that the South should have fought the type of battle that it fought (open battle against the north), then he was a very good general.
The main complaint against Lee is that he didn't realize that he couldn't win a war against a superior foe that way, and therefore he should have adopted guerilla tactics.
But, let's face it, if he had adopted "guerilla" tactics, the New York Times would have called him a racist.
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