Ian Happ is the quintessential Cub in my opinion. He is not a superstar but a very above average baseball player on O and D. And when you compare him solely to other right fielders, he stands out.
The Cubs have NOT tried to mix superstars with steady players. They have tried to assemble a group of above average players, prioritizing depth ahead of total stardom. Happ fits right there. I see why people want more from him but I also see why many think he is underrated. If you just look at WAR, he is.