The way I see it...
If your scouts/organization, and most other league scouts and organizations all think a guy is the consensus best pick at a specific spot, and he makes that pick, and the player busts, yes, you as a fan can be bothered by the fact that it happened, but it won't be because he "made a mistake" so to speak. It would be because the player didn't develop how everyone expected him to. So yeah, he can take a little blame for that, but it's not nearly the same as going off the board and picking some random guy that no one expects to go in that spot, and him busting. It's almost a damned if you do, damned if you don't situation really. If he goes off the board, and the pick hits, he's a genius. If he goes off the board, and the pick busts, he's the devil incarnate and should be fired. If he picks the consensus BPA, and he busts, he's also the devil incarnate. If he hits, then it just reaffirms what everyone thought.