Is anyone else reading Agustina Bazterrica’s Unworthy and finding it not that great, after Tender Is the Flesh?

I had very high expectations after loving TitF, but I'm not compelled by the vagueness and confusion over what's going on, who the various characters are and how they differentiate. Not an awaful lot is happening and when it is, that's confusing too – it just feels like a bit of a mess, wrapped up as ambiguous mystery / worldbuilding.

Is this a case of a writer hitting paydirt with one book and then getting carte blanche with the next one?