It is Andre Wadsworth for me though I get the Leinart arguements. My thought is Wadsworth was the sure thing. He was Jadeveon Clowney, the can't miss pick, and he got hurt. It wasn't an attitude thing, a talent issue or a legal issue. Wadsworth just got an injury that pretty much ended his career despite his freakish athletic ability. That is most frustrating to me because it was out of anyone's control.
Just plain bad luck which is very frustrating.
Leinart just wasn't as good as he was projected to be and didn't seem to work hard enough to overcome that difference. That is poor scouting in my mind, and while it sucks, I can at least wrap my head around it and see how the mistake was made.