Patton commanded the first all-black units in US Army.
Was he racist? Let me ask you back, what is racism? Some people openly talks that he/she dislikes certain group of people, but they are okay when doing things together. But some people never talk about it or even goes as far as publicly showing that they are politically correct, yet they still can't accept it when dealing with people different than theirs.
Best generals? At least he is much better than Lloyd Fredendall and today's overrated US generals.
His tactics? Similar with Rommel: he is no sitzkrieg generals, they don't like static defenses, hence their dislike for fixed fortifications. They are quick action generals, sometimes with little regards towards logistical challenge. The Invasion of France clearly shows how fixed fortifications like Maginot line fails. But you can't deny the effectiveness of Sevastopol or Leningrad defenses against such massive siege, but then it also owes to their relatively strategic position. There are some more thorough, strategic, complete, decisive commanders like von Rammstein, Kesselring, Zhukov, Bradley, Nimitz, and alike.
So to conclude him based on that view alone: is he one of the best? I would say yes.
I don't usually take a drastic contrast look towards mainstream historical subjects directly. Many said Rommel is the best, many say Kursk was the biggest tank battle, Montgomery saves Britain, Italians were the losers, Mustang D was the best fighter.
Yes we know that Italians won some battles, yes in FH2 it is not correct to portray the small underdog factions as the mainstreamers see it: but it is too hipster. Italians did lose badly to Greece, they lose badly to Commonwealth forces in early North African campaigns. They however, performed better under Rommel. But nothing says that they did well in WW2.
So, if you are trying to overturn a mainstream views toward a WW2 subject, better back it up with lots of evidence.