He was certainly effective, but he was also a blunt instrument. Like with Stalin, recognizing that quantity has a quality all its own isn't particularly brilliant. I would give the brilliance nod to several of his opponents. And even among the Soviets, I'm more impressed by both Vasily Chuikov and Konstantin Rokossovsky, both of whom, I think, showed better understanding of subtlety and tactics.
Well, it's like comparing Robert E Lee with Ulysses S Grant. Generals like Lee and Rommel are 'brilliant losers'; Grant or Zhukov might appear plodders by comparison, but they are victorious plodders.
"recognizing that quantity has a quality all its own isn't particularly brilliant" - I tend to disagree. I read a lot of military theory exalting the WW2 German Wehrmacht (eg William S Lind) and their perfection of maneuver warfare, their ability to psyschologically and physically collapse their foes through the skilled application of maneuver tactics. But the Germans lost, despite excellent training and excellent tactics. Zhukov, like Grant, had troops relatively poorly trained, and with less of a 'professional warrior' ethos than their opposition. Both men recognised the need for the consistent application of overwhelming force at the decisive point. Their tactics might not look particularly pretty or elegant - but they worked, consistently - against highly capable foes.