You have touched a very important topic of Pakistan Affairs.According to my experience,Pak.Aff can be scoring if u learn the art of producing and presenting an answer marked by your logical and critical analysis.
when you talk about the O.R,after defining and explaining its main points just forget that you are a Muslim and a definite subcriber to the two-nation theory.you must also take the view point of the critics of the O.R e.g(Hindus and some Muslims like Iftikhar ud Din) who vehemently opposed the very rationale of the O.R.And you see that even today there are certain scholars and historians who believe that the O.R. was nothing but just an attempt to appease the religious class of the country.These critics opine that the O.R.confused religion with polity unnecessarily.In the end u can simply conclude that inspite of all the opposition and criticism of the O.R.,the fact remains that the O.R proved first step in the constitution making of Pakistan and set a tone for future Constitutions of the country.Infact,it serves as the Magna carta of the constitutional history of Pakistan.