When there are one or two tanks on the opposing team that kill everyone and can't be destroyed. They just dominate the game and the battle becomes so one sided its not fun.

I was never really a non-purchaser but I did buy crystals to upgrade and get supplies but I always used supplies modestly in battles. With the introduction of overdrive though, the battles are all one sided blood baths. There always seem to be one or two tanks on the opposing team that are so juiced up that they can't be beat. I have been in battles where one tank single handedly kills every tank on my team. Its very discouraging. So the ones that have the most supplies tend to keep getting the free supplies because they are so strong. I didn't mind spending a bit of money before but it seems like I need to spend a lot now just to be modestly competitive. Its rare to have a battle that is evenly matched. When its two minutes into the battle and the other team has already captured three flags....I leave. So anyway. The proliferation of supplies has definitely changed the game