OK, re-reading your comment: Yes, I agree of course it is not super-human. People are impressed because it's able to express itself like a low-to-mediocre-skilled human, which still seems like a pretty high bar.
I agree. I see a lot of ratcheting expectations in this thread, in response to some truly amazing and frankly frightening capabilities. Those rap lyrics IMO are at least as good as many, many lyrics in actual successful songs by real humans. Most song lyrics aren't very clever.