Even of recent vintage, Chad Jackson.
Need to distinguish between guys that didn't contribute because of injury and those that didn't contribute because they just weren't good enough, or fast enough, or smart enough, or tough enough. Injuries are 99% bad luck - they don't tell you anything about the scouting process. Hell, was Robert Edwards a draft bust because he blew out his knee after his rookie season?
The other stuff is what you'd hope to pick up in the whole draft process, that's what you want to look at.
Third rounders aren't considered a sure thing, anyway.