So first - they only have validity because of the dirtiness of their lyrics - amazing. Outkast, De La Soul, Nas, Tribe, all managed to make a point without relying on dirty lyrics as a crutch.
And this is not the youth of today that I know - I go to school with 30,000+ 18-21 year olds who are for the most part pretty intelligent, hard-working kids with goals in life.
Finally - I love how quickly they managed to turn their "art" into a commodity. Now all of the "real" fans can say - "I had their tumblr bookmarked when they were just starting, before they went mainstream".
This bullshit celebration of "youth culture" reeks of exploitation.
tl;dr I'm old get off my lawn.
It offers a contrast to the picesofshitprepackagedrap bit in most pops songs? Every generation has some shitty music corp offering them the music on a plate that they "should" like. Dont 'cha just like to tell them to stick it up their hole? I could give many examples but sure Punk was never world renowned for its fabulous singers now was it?
I guess if that's what you're basing your comparison off than yeah sure this is wonderful - but compared to actual hip-hop, I just don't find it terribly exciting or inspiring...