Here is ESPN's evaluation of Petty:
"Petty is a prospect that may begin to garner more interest as his senior campaign gets under way. He possesses very good size and a strong arm and would be considered a true pocket passer at this point. Works out of the spread and is in the shotgun all the time which does not give us the opportunity to really see his footwork and ability to plant and deliver the ball on time. He shows very good balance and set up off the one-step drop, feet are quick and he generally has a very good idea of where he wants to go with the ball. Ball comes out quickly, he shows very zip and the ability to fit the ball into some tight spots in the short and intermediate passing game. He does not wow you with his arm strength, but he can make throws vertically and outside of the numbers, he just doesn't get many opportunities to do so. This is a Texas Tech-like scheme, dink and dunk for the most part. Throws very well on the move to both sides and is an accurate, technically sound passer with his feet underneath him on a consistent basis. Petty's delivery can be a bit mechanical and over-the-top and gives the appearance that he's pushing the ball a bit. Would like to see him work from under center some in the dropback passing game. Doesn't show much power downfield or have many chances, is more of a timing and rhythm thrower to a particular spot. Overall, Petty is a solid performer that has something about him that you like. He is tough and performs with a high production level. Good prospect."