The music. It's electric and not swing-based, so if those are deal breakers, fine, that's a matter of preference.
But it's also chock-full full of delightful compositional quirks, idiosyncrasies, and shifts. To call it "hideous" is too much for me. I get that it's not at all to your liking, and that's totally fair, but...
A lot of people still want to think of Wayne as a "blower" and a "tune writer". He's not been that for several decades now, nor do these albums even remotely come from that perspective. His mind has kept evolving, as has his palate. But when he's not what people want him to be/think he should be for them, it's somehow his fault. Still not sure how or why that's supposed to work...
What these albums do is showcase Wayne the composer, and as such, there is no shortage of substance therein. I realize that's also just an opinion, but "hideous" to me implies something totally lacking in inventiveness, substance and integrity, and I can't hear that in these albums, not even remotely. I'll not say that they're all "perfect", but there's plenty of music to be had in them. Plenty.
You want to know "what happened to him"? Easy - he kept growing and ended up going to some different places.It's not like he went brain-dead and forgot how music works him or how he works it.
No more "nightclub music", to use his words.