The first 30 minutes - 1 hour is fun. The issues come in later on. While the ads are annoying, I don't feel more enjoyment from a game by paying a whopping 10 dollars to remove them. The gameplay itself is fun at first, but the AI doesn't actually change throughout the entirety of the game. They simply have higher Regen rates and more starting units, forcing you to watch the unskippable ads just for the meager bonuses after a level. The ads ARE annoying, but I feel playability is the real issue.