What do you mean by 'old world shit'? If you are referring to the calvary sword, he invented that literally right before they were rendered obsolete. And the few times it was used, it was frickin insane, he essentially realized how stupid slashing from a horse was and decided to shrink a lance to convenient sword size. It was simple, ugly, but gosh dang was the sword effective. As soon as tanks started coming out, he applied Calvary mentality to them, and it was far more effective then what anyone else was doing.
Now if you mean a lot of his attitude, then it's hard to argue except for the simple matter of the results of what he did. If he did drop his attitude, he probably wouldn't have had the ability to make Hitler and his top men shake in their boots everytime they got reports on Patton's movements.