I was displeased to see reproductions of drawings, along with a (nearly?)
full scale reproduction of Picasso's "Guernica" in the recent Picasso
exhibition at the Los Angeles County Museum.  The issue for me is not the
mystique of the authentic object.
 
I'm a painter, and value the chance to view paintings and drawings.  In
museum exhibitions, I would prefer to view authentic work.
 
No doubt this opinion, which is obvious, has been expressed before here, but
it merits restatement.  For me, art's entire value is carried  by original
materials.
 
Thanks for the soap box.