Hi:
I think that both women had very different ways to see the life and the world. Marie Feodorovna didn't mean to be mean to Alix. She criticized her, only for she wouldn't act like Alix at all, nor socially, nor politically. Marie was an "Empress comme il faut", this is she loved the great imperial balls, and to be a leader in the imperial society. Alix was a shy, middle-class minded woman, with high Victorian values, but she couldn't fit the standards that her mother-in-law thought a real Tsaritsa would have.
My own opinion is that both were good empress, but they have very different styles. For Marie, an empress must be resplendent, sparkling and love socials , beatiful dresses, etc ; For Alix an empress must be over all things a model for all the mothers of Russia, the mother of Russia herself, a religious person. For Alix, religion, family and Russia are her whole life.
The Marie-Alix relationships were complex, as mariefeodorovna said. Two woman so different couldn't understand each other well, and besides, both tryed hard to influence Nicky. I can understand both of them, and I like Marie and Alix , however, in very different things. For me, Marie is the ideal empress. Alix, a great mother, a great wife and a deep sincere religious woman.
RealAnastasia.