Depends on what the QB shows you. It isn't black and white. If finding a QB was a science, every team would hit on it without issue. Sometimes patience is rewarded. Some teams are more patient than others.
I don't think I'll ever fully understand what the mindset was behind trading a future first round pick to get Sammy Watkins. Did Doug Whaley really think they were one player away with EJ Manuel as their quarterback? That move eliminated any opportunity they may have had to exercise patience.