Realism assumes the state to be the paramount player in the economy, and the state is assumed to be unchanging monolithic entity. The problem with this assumption is the non-consideration of agency and internal factors that have an impact on state behaviours. Since most of the realism theory deals with power and the state, a misguided assumption of the state and power relation is the worst failing of the theory.
I believe the weakest approach is the feminist approach because it emphasizes on the relation between power and gender instated of emphasizing on the unequal dissemination of resources and power. The best insight of the feminist approach is that women have been oppressed systematically with men historically being dominant. Despite this being the main insight of the theory it lacks a direct relation between the iniquity of power and resource distribution by emphasizing on power and gender relations. The need to cater for unequal power and resource distribution under feminism was not dealt with until recently with the advent of contemporary