More PIMS than points is ridiculous for so many reasons. Really being a top 15 pick is jack all? I would say a top 15 pick means a lot.
Stars don't accumulate penalty minutes because they're focused on being stars, which means big minutes producing or preventing a scoring play.
Players who accrue penalty minutes usually don't get the playtime to be stars because they're sitting in the box.
The best skilled physical players (i.e. Iginla, Getzlaf, Howe) outscore their ridiculous penalty minutes over the course of their career. Of course, some don't and obviously it is easier to be penalized than to score but again, Kassian is not in the same conversation anyways.
On average, roughly ascertaining from various sources, a pick at #15 has somewhere between a 40-60% of making the NHL. In Kassian's draft year, 10 players never even made it to the 200 game mark which is a common but loose description of a "successful" draft pick. And again, Kassian would fall outside of the top-15 in a redraft quite easily.
The only thing being drafted means, is that they were drafted. No more, no less. For every McDavid surefire #1 overall, there are the Daigles and Datsyuks, misfires and missed picks.