Well, Naushad is a giant, no doubt. But if he did only part of the music-making work and left a lot to his assistants, it is unfair, IMO, to hail him as a genius non-pareil. We had MD's lile Salilda, who innovated in tune, melody and orchestration.
Compare the current scenario - Anu Malik does basic tunes, and leaves the rest to his 'Asistants'. AR Rahman designs the whole song himself. Who would you call a genius? It is a no-brainer , really. Now, dont come back saying it is blasphemy comparing Anu and Naushad - this is just a comparion of the scenario not of the persons involved.
No one questions what Naushad was capable of - but if he lazily allowed his assistants to do the job and took credit for it, then he does deserve brickbats.
As a process, if all a MD is expected to do is provide raw melodies and the rest can be taken care of by professionals, then what individulaity does the MD provide.
Also, this explains why it is difficult to differentiate, say, a Naushad Melody from a CR melody. The professionals have filled in the blanks.
The difference between good and great, IMO, is that the great can be unequivocally credited for their art, from conception to execution.
Like they say, it takes a great team to perform a symphony excellently(and the conductor duly takes primary credit even though the team has performed) but no team has ever produced a excellent symphony .