Franz 'recycled' Rutherford's writing too. All those prophetic drama articles from the 1960s and 70s are rewrites of Rutherford's articles from the 1930s, with slight changes.
Worst Franz books were The New World, a commentary on Job as a prophetic foreshadowing and The Nations Shall Know That I am Jehovah - how? Probably The Nations book was the worst for obtuse, over writing. When I read it, I mentally edited it for clarity. All of his books suffer from convoluted grammar. Also, in the first edition of NWT he tried to present the "flavor" of Hebrew by using reflexive pronouns. Even in the 1960s that was questionable grammar. I can't count all of the "He himself" bits in the early NWT.
Franz never stopped being a Russellite, and he practically worshipped Rutherford. That shows best in Let Your Name be Sanctified, where he saw the transition from Rutherford to Knorr as a prophetic fulfilment. I never met him, of course. But I'm fairly certain I would not have liked him.