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This game is one of them "Pay to win" games, basically if you have lots of money you can dominate the battlefield:
Buy Special tanks
Buy Magic ammo that hit's harder
Buy special Camo that makes your tank hard to spot (coming in 8.0)
All of these cost real money so as you can see it's clearly a pay to win game.
Once you hit Tier VI you pretty much need either a premium account or Premium tank as the grid becomes impossible, you simply run out of money. So if like me you play free then you should play mainly low tiers, it's fun and free
Don't pick Germans as the game clearly has anti German mechanics, their tanks have been nerfed into the ground. I was a German tanker in this game but switched to USSR and have seen a clear advantage.
So play France or USSR, play to Tier VI and you can play free and have fun.