I like the disco Beethoven's 5th.
The issue seems to me to be how people 20+ years on feel about the practice of sampling in general and not the pedigree or purity of the source or whatever..
My own background, while I have liked Classical music since childhood, has been in large part rooted in various types of music which use samples. Early Hip Hop, Jungle, Drum n Bass, "Trip Hop", "Nu Jazz", Broken Beats, and all manner of eclectic strains of "electronica". As such I have a different perspective as to the artistic merit of some of this music, than say, a gigging musician, or someone who wouldnt or couldnt distinguish between stuff like "Can't Touch This" and someone like DJ Shadow or the Avalanches.
In many cases Jazz & Soul musicians embraced the onset of sampling in Hip Hop for example and even collaborated with them.
The level of inventiveness, creativity and technical skill that goes into the best of this music would shock some people. A good Hip Hop Dj or Electronica producer for example, can take anywhere from 5 to 8 years just to get to a level of expression that arguably can rival that of an emerging Jazz or experimental musician who might take the same amount of time to get to a point where improvisation, control and creativity are possible.
The range of references, influences, sophisticated research and collecting of (usually very rare) recordings also takes as much passion and effort as developing literacy in any other true artform. Gilles Peterson in the UK is one example of someone who started in and championed this underground music and culture and now has one of the most respected record collections and BBC radio shows in the world.
The intent or aim of the music has a great deal to do with things as well. The sort of discourse surrounding history, context, language, disposability vs longevity in culture etc.. has elevated to the point where dialog occurs with mutual respect among classical, electroacoustic, jazz, and various experimental composers and this new breed of electronic/sampling artist.
John Adams Speaks very highly of Aphex Twin in His memoirs. John Toop covered everyone from Debussy, Stockhausen and Cage to Eno, Lee Perry snd Bjork in one sweeping survey of "ambient" music.
Also check out this really interesting record :
Warp Works & Twentieth Century Masters