Marc Aurel critics

In the literature on and about Marc Aurel (Brenan 1882, pp. 484) the end of the ancient world is mentioned frequently. This refers to the beginning of the end of the Roman empire and the rise of Christianity to be become more influential. What caused the decline? The nepotism in the governance structure through the placement of family members to influential positions and as successor alienated many followers who previously believed in the high moral standards advocated by Marc Aurel.
Justifications of superiority by social origin are standard at the time of writing, but Marc Aurel did not see the potential of a more equitable distribution of offices. Women were relegated to subordinate or no public positions and are not mentioned with respect to  the importance of reasoning or social competence either, none but one in his acknowledgements (Book 1). The discrepancy between the formulation of virtues as well as ideal standards versus own practices of hierarchical leadership, recourse to slavery and brutal upholding of the empire should not go unmentioned.