Every top-level player I've faced so far has built a ton of T34s. Maybe they know something you don't. Like how 2 play.
The irony is real in this statement.
I've personally found the new T34/76 under-perform dramatically against armor'd units thx to the reduction in reload time. Only after equipping it with 3 special t-34 bulletins have I found it actually become useful.
And for those wondering, I know for a fact that the Sherman is more effective than the T-34 by far, after using both extensively against high lvl and low lvl players. Better penetration, better AI, has a topgunner. And is only a little more expensive than a T-34. Totally would take it every time. Which is why I think USF is better at countering OKW than Sov.