Predator why was it such a bad transfer

[Stu123]

Im sure you all agree it dosent look great on blu-ray but was just wondering why a film would turn out a bad HD transfer.I cant see why a major film studio would use bad quality film for one of its movies so surely its not that.I cant understand how a 1960's john wayne film the searchers looks amazing and a 1980's film looks dissapointing.Its obviously got an excess grain problem im puzzled what causes the grain too and why is it always in the background and never the foreground.I dont mind the grain i understand its because all the detail of the film is coming out but when its excessive like predator it becomes a mess.Maybe DNR should of come into play on this to tone the grain down.Saying all that though i think every blu-ray is always going to be a worthy upgrade from dvd.