I can look at his play calling, including a 30 yard fade on 4th down at the end of the game. That route shouldn't have even been in the read progression. And frankly, his play calling with Rattler was pretty bad.
I think he's an okay OC, but he's not great and lacks any real originality beyond running the system that his dad and Mike Shanahan built. And this isn't his first shot at being a OC and those results were mediocre as well.