Harrell displayed the potential to be the next great passer for the Red Raiders as a freshman in 2005. He completed 67.3% of his passes for 422 yards and three touchdowns with zero interceptions as a backup. He moved into the starting lineup as a sophomore and became one of the most prolific passers in college football history. He passed for 4,555 yards while completing 66.9% of his passes for 38 touchdowns and 11 scores. He was even more impressive as a junior, completing 71.8% of his passes for 5,705 yards with 48 scores to just 14 picks. Harrell closed out his career winning the Unitas Award along with various All America honors after throwing for 5,111 yards while completing 70.6% of his passes for 45 touchdowns with just nine interceptions.
Strengths
Harrell has a ton of experience throwing the football, and has posted some amazing numbers. He has proven to be very efficient with the football and does not turn the ball over much. He is very accurate on intermediate routes and gets rid of the ball quickly to his target. Harrell has proven to had a good enough arm to make any throw at the college level, and can put the ball on a line in certain situations. He�s also shown decent mobility and has the ability to elude the rush to find more time to get the pass off.
Weaknesses
Harrell has only average height and has a thin frame, so he has some physical work to do. He must bulk up and get stronger to show he can take the beating QB�s inevitably take at the professional level. He really will not impress you with any physical tool, he just gets the job done on the field. The real issue Harrell is going to have to face is the history of Texas Tech quarterbacks. Playing out of the shotgun and slinging the ball around the field is great for the passing numbers but none of his predecessors have made it in the NFL. He will have to learn to take the ball from under center and learn to survey the field while dropping back.
Future
Harrell has some talent and toughness, and could surprise if he�s allowed some time to develop his skills. The lack of success Texas Tech QB�s have had will definitely hurt his draft stock, but teams should see that he has a decent arm and has the toughness and leadership skills to develop. If he is placed with the right coach, he could be the first Red Raider QB to find a home in the NFL and keep a job.