If you look at the way the Sharks' roster is built and break it down by acquisition type you have
Players acquired via trade (7):
Thornton, Burns, Kane, Jones, Dillon, Fehr and Hansen
Players acquired via Free Agency (9):
Boedker, Donskoi, Goodrow, Karlsson, Sorensen, Ward, Heed, Martin and Dell
Players acquired via the draft (10):
Couture, Hertl, Labanc, Meier, Pavelski, Tierney, Braun, Demelo, Ryan and Vlasic
I've bolded the "core pieces" as they currently stand. (People will argue that Kane shouldn't be a part of this group, but given his extension, I think it's pretty clear the Sharks consider him part of the core.)
The Sharks best and most important players at each position were acquired via trade. If you want to argue that Thornton is no longer the Sharks best forward, that's fine, but up until recently he was obviously the Sharks best player. Anyone who wants to argue that Jones sucks, that's also fine, but he's the #1 goalie right now, and his back up was UFA signing, plus the system is devoid of goalies. People can also argue Burns vs. Vlasic if they want, but that's not really the point of all this.
The point of all this was simply that Tim Burke and the scouting staff have gotten away with poor picks in the earlier part of the draft because Doug Wilson has managed to acquire the most crucial team needs via trades. In some ways it's a credit to Doug that he's managed to take the players drafted and 1st round picks and either turn them into core players, or attempt to turn them into core players. Michalek turned into Heatley, Bernier turned into Campbell, Wishart and Carle and a 1st turned into Boyle, Setoguchi and Coyle and 1st turned into Burns, 1st for Kane etc. Of course the begs the question, should he even have to do that? If the scouting staff had taken a different approach and drafted Jeff Carter instead of Michalek or Getzlaf instead of Bernier, or Bergeron instead of Hennessey, or Weber instead of Carle, or Kopitar instead of Setoguchi etc. etc. etc. would those trades have even been necessary? I in no way want to discount the work that the scouting staff has done in Europe, or in the later rounds, because they've clearly done very well. However, you would think that had the drafting been better in the early parts of the draft, fewer pieces would have had to been moved to accommodate for those failings. If that had been the case, it's not difficult to surmise that the depth of the Sharks could have been better and the prospect cupboard less bare at all times. Overall, the poor early round drafting has had a trickle down effect on the rest of the roster decisions. That issue seems entirely fixable, and if it's fixed, it could do a lot for the future of the franchise. If the status quo remains the same, then I think it's safer to assume that future 1sts and players drafted in the 1st are more likely to be traded than to become the franchise cornerstones we hope they can be. Which in turn means, that the Sharks will always be looking outside the organization for solutions.