And the ISU and if you really must, the Elefant though I don't see what Elefant's problem really is.
The problem with the Elephant is that it does to tanks what ISU does to infantry.
The other problem with the Elephant is that it has no counters given that:
1) it comes in a doctrine that eliminates the most logical counter to a slow-moving heavy tank destroyer: artillery
2) is able to destroy any armor that tries to counter it
3) Soviets have no effective infantry-based AT
4) has incredible range AND sight
Mines, ISU and Elephant all need a hotfix. Apart from that, this game is way more balanced than it has ever been.