And now for a fresh perspective, here's JGlass.
Rock and roll has always been more about the attitude than the particulars about what instruments are being used or how the words are being sung. Rock and roll is an umbrella that encompasses many different sub-genres, and many of these sub-genres have little in common. Take a band like The Sex Pistols and put their music up against, say, The Talking Heads. The sounds of these two bands are so radically different that it's almost unfathomable to say that they are in the same genre. And yet, here we are, both bands are in the Rock and Roll Hall of Fame.
One of these bands is from England, the other Rhode Island. One played music created by a bunch of working class teenagers, the other by art school students. One band played with anger and energy, the other played with calm anxiety. And yet, they are both considered rock and roll.
The one thing they had in common above all else was that their music served as an escape for those rebelling against something in their lives. The Sex Pistols gave a big fuck you to the establishment that seemed content to maintain the shitty status quo their whole lives. Talking Heads rebelled against rock and roll itself, taking a music that was driven by emotion and removing that, changing it into an avant-garde art form.
By these guidelines, NWA absolutely deserves to be in the rock and roll Hall of Fame, as do several of their contemporaries (namely Tupac and Biggie). These are men that not only rebelled against authority, the establishment, and racism, but also against the music industry itself. Making no attempt to appease the major studios or radio stations, they made music that spoke to huge populations, many of whom felt like they had no voice until gangster rap took off.
NWA absolutely encompasses the spirit of rock and roll and will be an excellent addition to the Rock and Roll Hall of Fame.