I hated the Mallet pick at the time. I still think Severson would have been the better choice, as many do. However, you can see "why" they took him. Skating, Size, Defensive hockey IQ, good fighter, high production in his 2nd draft eligible year. You aren't likely to get that combination in the 2nd round of a weak draft unless you take an older player like Mallet, and the only place they could take him was the 2nd round.
Even though I dislike the pick, I can reason the "why", which is all one can expect when evaluating scouting.
Fast forward and Mallet becomes a 3rd liner with those traits, Severson becomes a 2nd pair guy with his traits, who do you take? You know Mallet is going to make the opposition's life a nightmare, while Severson is a more passive option.
The Canucks want to take the game to the opposition. Mallet helps that more than Severson does. The only question is the upside. Is Severson a top4? And of what quality?