Quaterback Rating: Not an Accurate Judge of Performance?

Week after week, I have been checking back on the NCAA FBS passing leaders, keeping an eye on the quarterback rating leader boards, and have been surprised to see its results over that period of time. Obviously, all football fans know that stats can't always tell the story of how good a player is, but that isn't where my quarterback rating complaint lies. It is a stat, and still doesn't give a proper rating based on the other stats. The formula is legitimate, and that is not where I have the problem. What i take exception to, is the fact that touchdowns thrown per pass attempted is weighed too heavily. For this season's examples, we will use Tulsa quarterback David Johnson, and Texas Tech passer Graham Harrell.   David Johnson 172-258, 66.7 %, 331 YPG, 33 TD, 10 INT, 11.6 YPA: xxx.xx Rating   Graham Harrell 332-463, 71.7%, 407 YPG, 36 TD, 5 INT, 8.9 YPA: xxx.xx Rating   Johnson has a 2.7-yard advantage in each attempt, which gives him a nice boost. But Harrell ... (link)