Only on LGW does a GM "deserve blame" for building an almost entirely homegrown roster, making the playoffs for the zillionth time in a row, and being poised to upset a better team in the first round.
The only thing Ken Holland hasn't done is play/coach the actual game itself.
Has he made some mistakes over the years? Sure. Have those mistakes seriously inhibited our chances of being competitive? The results certainly suggest otherwise.
Or is he supposed to make no mistakes whatsoever?