If there's a compliment to be paid, I think it allowed athletic Q.B.'s to perform functionally pretty quickly in it. It wasn't complicated, and like most spread offenses, gives you some easy throws and some opportunities to run the ball.
But there was a ceiling. Kizer, Book, Wimbush, Golson were all largely the same Q.B.'s in subsequent seasons after their first as starters. You can look at the stats....none appreciably improved as their careers went on. None really made a leap.