It was a great game at one point. Now, it's nothing but an outdated cash grab that is using it's only leverage, market monopoly, to suck every cents out of you. It is painful to see how this game have devolved. With new op premium vehicles like the Ka-50s and an inconsistent damage model for vehicles (especially Russian), game plays only become increasing frustrating as you progress through any tech tree. Often, you will find yourself doing everything right only to find out that your shell did no damage at all or getting bombed/missiled by a plane/heli that is 6kms away that you can do nothing about. If you are drawn to here by an desire to play modern vehicles such as the F-14, Abrams, Leopards, T-80s, or any other top tier vehicles, o boy do I have a surprise for you. In order to obtain such vehicles, you will have to go through almost a year of painful game play. Even with a premium account, the process is still incredibly slow.
For your own mental health, just stay away from this game and it's hypocritical publisher who actively suppress it's player base on forums.