It is obvious that in World of Tanks every nation has different advantages over the others in every class and even in every tier, but do you think that a specific nation’s tanks are overpowered in general?
Every nation has its ups and downs and I think it's important to just go by which nation does best at what tiers or particular classes - the game's too complicated and messed up to find specific strengths in nations at specific tiers. I will say that that Soviets are pretty damned strong at T10. Soviet mediums are universally good, they've got a couple great heavies and the Obj 263 is one of the best T10 tank destroyers. T10 in general is pretty balanced. I think players accusing WG of having Russian bias sometimes have it a bit right. It's hard to go wrong playing Soviets.
I agree that Russia or China are kind of biased, but the rest of nations are quite balanced. They all have osmething different to offer.
I think the Russians are strongest overall. There is surely some bias from the producers there. But every nation has some good vehicles so it doesn't matter which one you choose in the end.
I would reason the most powerful nation is America. Other nations like Russia and China are also great countries in their own capacities too.
They all seem to have their strengths and weaknesses just like most other games, but I would say that your traditional countries are the best, and I always do well with England.
I think the most powerful nation is America then followed by china and Russia. But that is just my observation. I stand to be corrected. If it is the nation in the game world of tanks and planes, then I haven't played it.