Bingowings said:
The only person who comes close is Ian and he is trying his best with some really awful hammy dialogue which he manages to transcend with a genuinely creepy vocal and physical nonchalance (he isn't the Emperor I imagined from the more spooky ESB hologram but that's not his fault).
Making hammy dialogue sound good was one of the things that gives these movies their charm, as Harrison Ford found out ("You can write this shit George, but you can't say it.").
When it doesn't succeed...you get the prequels. All the Star Wars films dance on a razor's edge from becoming spoofs/parodies.