If any drafting GM is able to consistent produce 3-4 NHLers per draft year within 5 years for next 10 years then drafting skills do exist and able to produce at least 1-2 NHLer in a weak draft year then this does exist. With too many 31 teams, every teams would want 31 McDavids on their team but unfortunately, it can get only one and if other GM can win the cup without McDavid then he is considered a great GM with great drafting skill.
I don't think the bar is nearly that high to be considered above average.