Also rap being included shouldn't be a big deal, I watched old mtv year in rock videos from like 1991 and there was some mention of rappers. Same with rock n jock,obviously not just rockers in the softball/basketball game.
I never listen to rap, but don't think it's bad they give the most well known rappers a nod.
"Hey guys, you tripped over yourselves to induct Nirvana and Pearl Jam. How about Soundgarden and Alice in Chains?"
It's easy to see why Pearl Jam got in right away because they are more prolific and Nirvana cause Cobain is a cultural icon,with AIC and Soundgarden it's probably too soon consider the backlog of bands who were around sometimes 20 years earlier still not in.