To be fair, it does state quite clearly at the top of the list that "we asked listeners to pick their favourite from our list of Radio 2's Top 100 Most Played Albums." So it isn't claiming to be a definitive list of the best albums ever made, just a list of the ones played a lot on Radio 2 that Radio 2 listeners like the most, hence its overall blandness. I doubt Radio 2 have ever played a Clash, Specials or Sex Pistols record, and why would they, it isn't really what Radio 2 is there for.
Musical snobbery is alive and well though, always good to see. I think rap is a lot better than people of my generation would give it credit for, even though it isn't for me and I don't really "get it".
As Dara O'Briain says, "I don't understand how these sound waves going into my ear can be judged by someone else as being better than the same sound waves going into their ear", but that's scientist comedians for you.