Yes, Irene was more sensible, stable, capable and used 'control' in more positive ways than her sister.
I would agree that had Nicky married Irene instead of Alix, Irene may have been able to engender a more positive public opinion of the monarchy and herself, perhaps. Surely, Minnie and her sister Alexandra in England were able to purposefully sow seeds of dislike about Germany and Germans which did affect public opinion in a negative way which likely had some effect on how willing the public ultimately was to accept war. Likewise, Irene as tsarina may have had some impact in a more positive direction, but what would that have been? If she took a more pro-russian people approach, that would not have averted the war and the end would have been what it was. If she took a pro-German alliance approach, it would have run smack up against her mother in law and ministers, and she would have been sidelined...again the war would have occurred regardless.
the war and its never ending misery did them in.