The problem is that you don't only have to know good generals but also how they were classified by others. I would never have named f.e. Washington, Grant, Montgomery or Patton because I didn't know they were so highly esteemed somewhere, or better said more than they deserved.
I cannot find the most overrated general in the antiquity. I don't like Caesar as a politician but he managed to win many battles against different foes. Hannibal succeeded in deeds in which most would not. They are only second to Alexandros III. in my opinion. All were highly esteemed also by their soldiers.
Maybe my choice would be Rommel. He was a kind of military popstar. A good general more or less but if you look at his terrible mistakes my thought is that he was overstrained as an army commander. That was also the opinion of the German army high command.
Perhaps also Frederic the Great is a possible candidate. A very good general indeed but not nearly the military half-god many people see in him. You should read what his brother Henric, a very able general himself, who won the last deciding battles of the Seven Years War, thought about Frederic, it's not so nice.
BTW if I have to name a military leader (wether good or not) who overrated himself the most I would clearly say Hitler is the best candidate.
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