3.5/5. Great game, I enjoy the different events modes (raids, skirmish, adventure) for the strategy you can use. As many have said newest scaling is bad. The resource cost is spread out but feels terrible and disheartening when you upgrade for virtually no difference. Before each level made a difference... Now you have to level 10 times to think you've done anything. Unless they are willing to roll back the scaling or lower it, a possible solution would be give units more intermediate upgrades.