Easterhay said: In fact, James always said that Dave was Darth Vader - the kind of humility that Prowse could learn a lot from.
I agree, but I have not heard Prowse say anything against Jones direct.
edited - I found this interview in which Prowse seems very fair to Jones.
http://www.galaxiki.org/feature/darthvader.html
On the other hand I can understand his resentment toward Lucas, if, as Prowse claims, Lucas promised that his voice would be used, and then used Jones anyway. I am not sure if this is true or not, but I can believe it of Lucas. Much as I appreciate Prowse performance though, his accent really would not have worked for Vader.
Does anyone have a link of Prowse criticising the prequels?