I think you could probably compare it to rock in the 1950s - 1970s, or jazz even before that. Each of these forms were not appreciated very much by the generation that came before that style was popular, but was appreciated by the younger generation of that time.
"Rap", which involves the spoken word, is fairly old school now, going back to the 1970s (some would say earlier), overlapping with hip-hop as a musical style. I hear a fair amount here. I'd hardly consider myself a fan of the genre, but I'm a fairly old guy, so I don't judge too much (I think about my parents, and how they let Led Zeppelin go in one ear and out the other without editorializing or telling me to turn it off). Like rock n roll, some of the rap I hear is good, some is boring; TBH, I couldn't name 5 rap artists if I had to, but my boys probably could. I sometimes hear someone listening to rap (hip-hop) where the lyrics are about something interesting or important to the artist, that can actually be quite good; poetry even. I hear some that seems to be about nothing more than misogyny, crime and violence: not very interesting to me. Bringing it back to the rock comparison again, it's like comparing Bob Dylan (or Eric Clapton) to The Archies; you pick which of those you'd prefer to listen to.
It is also sometimes interesting to hear the way verses are put together to rhyme and flow from one subject to another. Again, a few seem to do this well, many do not. There are some forms that seem to involve a lot of improvisation, that can be interesting too.
For now, rap and hip-hop are enjoying a few decades in the sun. When people of my son's generation are parents, there will be some new musical/spoken word form appreciated by their kids that may be unsettling to their parents too!
