Whether or not grading drafts is dumb depends on how you grade them. Typically following a draft if you ask HF who 'won' the favoured teams, when people aren't just picking their own, it's usually the team that drafted the most 'fallers' where as they fall every teams fan hopes they grab them. But than that begs the question... why are all these professional scouts passing on the player?
On the other hand, there are certain things you can pick up on. Drafting a guy like Nathan Smith pr Patrick White in the 1st round is just a boneheaded move period. Trades made, judging value of the NHL player going out and the position of the prospect coming in, can be judged. Wasting picks on almost guaranteed late round busts on CHL depth players who lack the talent to even score in that lack but have good 'size', the Evan Fuller, Dan Gendur, or Sawyer Hannay's of the draft, are dumb moves. You can see this in any draft, 75% chance if a last round pick makes it anywhere it's a skilled European kid who's playing in some European league. This applies to use as well, with Tommernes, Bliznak, and Hansen.
So you can't really so much on Bennings first 5 round picks, but you can cast judgement on the trades and the decision for the last two picks.