Not necessarily. The relative effectiveness of factions changes with skill level.
If both players have poor positioning and use of cover then OKW is better than Ostheer because blobbing with Ostheer is a fast track to defeat. If both players are highly competent Ostheer appears to overtake OKW in effectiveness: there's a clear preference for Ostheer over OKW at top levels.
If two players have exactly the same skill level then what?
With some 1v1 map OKW will capture 80% of the map before CP3 when soviets can bring Ppsh. Soviet MG just cannot stop Volks and Strums. Sniper is too costly and risky. CP only advances if there is a fight or upgrade. So necessarily some conscripts have to be sacrificed and it makes the OKW units veteran quicker. Then it becomes even more harder to fight back a veteran Volks or Strum.
Maybe Soviets can have a tactical advantage with some maps, but for most small 1v1 map OKW has a massive advantage against Soviets. That is why most players have higher win rate with OKW than other factions.