8. Ian McDiarmid is amazing
Returning to play the same part he held in the original trilogy, Ian McDiarmid transcends the shoddy dialogue and questionable script, making practically every scene he is in worth watching. He has this in common with the aforementioned Ewan McGregor, who also was able to shine despite obvious issues with the writing. McDiarmid is wonderful in all three films, and becomes downright terrifying when he makes his big reveal as the head honcho of the Sith.