[Nick Zwar]

People evaluating Hans Zimmer scores by the criteria of classical orchestral music, for example. Which would be akin to evaluating Bob Dylan by how he well he writes techno music.

Not quite… I mean, both Hans Zimmer and Miklós Rózsa compose(d) film scores, so is perfectly legitimate to compare the two in that function. Obviously, film music does not have to be “classical orchestral” music, it can be jazz or rock or pop, but you can compare how effective you find one or the other approach for a certain movie.