Geralt isn’t beating 90% of Warcraft characters. He only has a chance against low tier fodder.
Hell, there’s fodder that would smack Geralt and most of the Witcherverse, such as Fel Reavers.
Anything that’s around Saurfang level or higher would stomp him. The only named character who isn’t one note that he could stand a chance against would probably be Anduin.