People have been saying that "zp has been getting worse lately" since practically two weeks after Yahtzee first joined the escapist.
For this to have been true, that the quality of zp has been steadily declining for years, each zp episode should have been nothing but Yahtzee yelling incoherently into a microphone for 5 minutes by now.
This leads me to believe zp is not, in fact, getting worse. Like everything else, zp has had its good episodes and its less good episodes, but all over the series is as good as ever. It's just not novel anymore, particularly since Yahtzee has more or less found the form to stick to.
This coming from someone who has been watching zp since 2007.
I do miss the old song snippets though.
If you want to know what it looks like when a show actually does get shittier over time and it's not just the fans whining, go find the Unforgotten Realms archives and watch the entire series as it aired on the Escapist.
It should be somewhere on here still.