Yo de todos los analisis que he visto (algunos demasiado complacientes) y habiendo visto las 2 primeras y zapeado un poco la 3ª, creo que la review de Highdefdigest es la que mas se ajusta a la realidad.

http://bluray.highdefdigest.com/3287...retrilogy.html

All three movies display great definition and clarity, whether we're watching Marty narrowly escape the clutches of Biff/Griff in the town square or riding the wild plains of the Wild West. Granted, there is some minor noise reduction applied and some slight digital tampering used to sharpen and clean the picture a bit, but it's nothing so objectionable as to ruin the quality of the film. We've seen much worse done to other favorites, and only the most discerning of viewers are likely to notice. The image still retains a very fine layer of grain and shows several strong moments of dimensionality. Fine object and textural details are exceptional for a catalogue title of this age. They're not always consistent, which is understandable, but it's much better than anyone could have expected. The worst instances are during the optical effects, where matte lines and softness are made more apparent. But again, this is a normal result of the available technology.

Acepta que hay un minimo uso de DNR, pero no lo suficiente como para arruinar las peliculas y solo percetible si estas con la lupa.

Se podia haber hecho mejor, puede ser pero desde luego esto no es para nada un caso como el de Gladiator o Spartacus.