I think Tarkin should have been in the PT more. Regardless of the quality of the makeup, it would have bridged the trilogies better. Does anyone complain about Obi-Wan's character because he didn't look enough like Alec Guiness?
Tarkin could have saved Anakin from the lava. Or been a close adviser to Palpatine. Tarkin's a cold calculating bastard, and they could have had a lot of fun getting him in the PT.