I dismiss tournament numbers with regard to draft picks because I find it's too noisy in predicting future NHL success. League play is a far better indicator (though imperfect) of suitability and likelihood of future success.
Conversely, if now that he's in the NHL and the reigning 1OA, he underproduces against WJC opponents my concern would be that his playmaking ability really is not sufficient -- since he will be back on international ice and playing against much weaker opposition. His playmaking ability (which means his ability to produce points, not "beautiful passes") is the biggest question mark I see in the player. His size, speed, stride, jawline, etc. are all fine and dandy but if he won't be able to put up points then he won't be any better than Josh Anderson or Joel Armia (... GOD FORBID!)
Slaf put up two points on mighty Kazakhstan at the WC, not two goals. My mistake. His performance at the D-list Olympics is irrelevant imo, and his performance at the WC is only somewhat relevant -- but we don't need to litigate this. He's drafted, he was bound to be a topX pick, and he's our 1OA. So we have to have a certain level of expectations from him as a 1OA (ie we can't just be impressed by "beautiful passes" that don't accomplish anything on the scoresheet) and we also have to root for his success and be optimistic (something I admit I struggle with).
I think HuGo drafted him because Gorton has a nasty, hardly concealed fetish for the unicorn winger. Kaako, Laf, and now Slaf. Let's hope third time's the charm