For writing, iirc most of the writers are from PnF seasons 3 and 4, and they are often considered inferior compared to the first two (I can't say myself because I've stopped mid-season 3)
The visuals don't pop. I understand they want it to look more natural. I actually like the color scheme when they're outside during the fall. However, in other situations the colors look too dull.
I don't know about the songs though. That's the only one I don't know why it got a downgrade. The musicians are pretty much the same, aren't they? Maybe they could've invited Weird Al to help with the music.