The Tiger Ace itself is a huge pain in the ass to deal with in a 1v1 considering that you can field other tanks before getting this monster of a tank; You don't need map control to get it and it'll always be something you can fall back on when the going gets tough.
Whether it's OP or not is a completely different question though. It does considerably reduce your ability to field other units once you have it and in essence it's just a glorified Tiger; It's great to have to make a come back (Because you're not getting any resources from territory anyway) but once you've taken a fair bit of the field back, your inability to profit off your land gains begins to hurt you a lot more than it does the enemy.
I personally don't mind going up against the unit and generally - if a player skills me with it - it's usually because he's a better player than me. I'm not really convinced the Tiger Ace is OP but it is an extremely powerful unit.
Everything else in the doctrine is fairly standard shit though. Troops training is more of a gimmick now that it got nerfed - Spending fuel on veterancy puts you back a long way unless you've got considerably more map control. The strength of G43s and Smoke canisters isn't really something specific to Elite Troops and stun grenades are also pretty gimmicky.
Despite some heavy losses sustained at the beginning of the game, the Soviet Heavy Armoured Division managed to hold strong in the face of Panthers, elite grenadiers and a Brumbar.
Shit. I was the one getting buttraped in that Image Was not nice.
The question isn't "Is the game balanced?" anymore. The question is "What purity of Crystal Meth were Relic and the Balance team smoking when they approved this patch?".