It seems to me all that secular media and papal critics take from these stories is that the Holy Father married couples already 'living in sin.' They seem unable to comprehend the act of reconciliation which occurred, the blessing it brought to couples - especially those with children. It demonstrated nothing is impossible with God - there is always a way back. The Pope blessed these couples, dignified and sanctified their love, uniting them to Christ and the Church. Surely the couples had been properly prepared beforehand to celebrate the Sacrament of Matrimony.
I like very much what the Holy Father had to say in his homily. An excerpt:
The love of Christ, which has blessed and sanctified the union of husband and wife, is able to sustain their love and to renew it when, humanly speaking, it becomes lost, wounded or worn out. The love of Christ can restore to spouses the joy of journeying together. This is what marriage is all about: man and woman walking together, wherein the husband helps his wife to become ever more a woman, and wherein the woman has the task of helping her husband to become ever more a man. Here we see the reciprocity of differences. The path is not always a smooth one, free of disagreements, otherwise it would not be human. It is a demanding journey, at times difficult, and at times turbulent, but such is life! Marriage is a symbol of life, real life: it is not “fiction”! It is the Sacrament of the love of Christ and the Church, a love which finds its proof and guarantee in the Cross. - Pope Francis