The "Mumble Rap" Era and It's Evolution Throughout Hip-Hop...

In rap, it seems styles, lyrics, and content get more crazy each day. Now, more than ever, this age old question is being discussed: Is being lyrical (with a message) most important, or is being "far-out/catchy" most important. Check it out: What are your thoughts on this Hip-Hop Universe video regarding "Mumble Rap" and it's evolution?