I agree about Zabriskie and Querelle (i'm not keen on several Fassbinder) but Salo i consider- disgusting as it is- above average Pasolini. His weakest for me are Canterbury Tales, and Hawks and Sparrows. 

I love several of Wenders' earlier films, and though many may not consider him a "great" director even for his best work, his decline has been a terrible disappointment.

Fellini Casanova (and some of his other later films are self-indulgent, repetitive doodling).
Coppola: Jack
Bresson: The Devil Probably
Bertolucci: Last Tango in Paris. 
I also find it hard to believe that a great director could have made Kundun.