If you take into account the drafting teams investment and a player doesn't have a productive "stint" with that drafting team, do you feel like the GM did his homework or that the drafting team did well on their investment?
If I am a stock broker and I continually give you advice on stocks that lose you money while you are holding them, but do really well after I have convince you to sell them, am I a good stock broker?
I feel like you are answering a question such as: "Did/Is Montavious Adams having a productive career in the NFL for a 3rd round pick?" To that question, I would agree with your answer. However, if the question is "Was Montravious Adams a good draft investment/pick for the Green Bay Packers, I would say "No, especially not for a 3rd round pick."
@Team Ronny mentioned Lawrence Guy. The Packers only invested a 7th round pick in Guy. Would you say Guy was a GREAT investment for the Packers, considering his career 13 years later? Had he spent all 13 of those years on the Packer roster and still had the same stats that he has now, I would say "He was an absolute steal and worth way more than the investment." However, he didn't play a snap for the Packers, so they got zero return on a small investment.