Most of the faithful oppose translating the Koran. The majority of the Muslim world does not speak Arabic. Iraqis do but not Afghanis or Iranians. Furthermore, most of the basis of Shari'a Law comes from one or more of several collections of Hadith (supposedly authenticated accounts of what Mohammed did/said on certain occasions). These are not widely available. This places believers at the mercy of the imams, who may or may not be well educated; who may or may not abuse their positions. Add to this the Doctrine of the Concensus, which states that whatever the majority of the faithful believe to be true, is true, and you have a mess to deal with. Remember, there is no central authority to define Islam. It's all local. Almost every observant Muslim believes that he practices authentic Islam.