"Sure-fire" does exist. In every round, of every draft, at every position. What there is NOT, is a sure fire slot position where these players are found. There is no sure fire pattern.
Every GM, of every team, tries every year, to pick the right players for their teams, in every round.
Nobody has done it yet.
Picking QB's has not gotten any better, IMO. It's just easier for them to succeed today. You can't hit them, much, and you can't touch a receiver. The rules of play help them look good sooner than in the past.
So, even though a lot of the more recently drafted QB's (last 3 years) have had decent starts to their careers, none of them is assured to be better than average at this point. Only time will tell.