As I said over on the other thread they should have cast an actor to play the role (not that Wayne isn't an actor, he was amazing in Farscape but he wasn't playing a role he was just wandering around in an unrealistic mask in the background).
I don't mind him looking a bit older than Peter would have done back then but they should have written a role for him to play or left him out altogether.
If anything it was a worse fan dis-service than Fett in anything other than ESB.
Peter was one of the things that made ANH work and to reduce Tarkin to someone dawdling around that doesn't even look like him was a sick joke.
Bill Nighy as Admiral Tarkin leading the Republican fleet during the Battle Of Coruscant would have been great.
That's possibly even too ambitious an idea for me play with.