In het meest recente onderzoek van het Europees Instituut voor Bestuurskunde (EIB) – "The Institutional Impacts of EU Legislation on Local and Regional Governments, A Case Study of the 199/31/EC Landfill Waste and 2004/18/EC Public Procurement Directives" – wordt onder meer geklaagd over de grote invloed van dit type recht: "using soft law to regulate very important aspects of the Directive is another important shortcoming: it is not possible to foresee the institutional impact of soft law".
Die jüngste Studie des Europäischen Instituts für öffentliche Verwaltung (EIPA) „The Institutional Impacts of EU Legislation on Local and Regional Governments, A Case Study of the 199/31/EC Landfill Waste and 2004/18/EC Public Procurement Directives“, beklagt unter anderem den starken Einsatz nicht zwingender Rechtsinstrumente: „using soft law to regulate very important aspects of the Directive is another important shortcoming: it is not possible to foresee the institutional impact of soft law“.
