Maguire I think those calling for his head after so few games and such a tumultuous close-season are the ones who need to provide justification and reasoning.
You've been around a long time old chap, you will recall Terry Bullivant. He came in after a great side had been broken up, made a wretched start and we never really looked safe from danger despite a mid-season mini-revival. The fans never took to him, yet many urged patience, give him time. He finally 'resigned' in March and by then we were bottom of the league without any realistic hope.
http://www.youtube.com/watch?v=LyRqdzF8swY