the t34/85 saw action yes,but it is only ever called in when when the soviet player is winning, it is simply too expensive to considered in a close fought game imo, change it to be called in 1 AT A TIME !!!!
You can call-in a T-34/85 once at a time when you build either T3 or T4 building for balancing purpose, same for IS-2
for German tiger, you'll have to unlock T4 as well