Assalamu alaikum
Some of our own Deobandi ulama have one objection on the Darse Nizami system; that is , that Darse-Nizami focuses of Fiqh and comparitive Fiqh even when teaching the Hadith books, hence a Darse-Nizami graduate does not have much expertise in Hadith and Usool-e-Hadith and related Hadith sciences.What is the answer to such people?
The Darse-e-Nizami is not designed to make an expert in any one particular science. It gives you the foundations thereafter one can diversify in whichever science one desires.