Repair Cost, Grind time required past rank 4, Russian Bias, and the fact that its only getting worse. Instead of having the philosophy of "create a good customer-company relationship for loyal customers and profit", Gaijin chooses the "pressure customers into purchases without improving the product". They add so much without spending enough time going back to fix the last things they added. There may be few military vehicle games out there, but if you're reading, go find/play a game that has purely passionate developers and unleash your tank/aircraft passion somewhere else that isn't 70$ premium pixel vehicles.