re: #94 Feline Fearless Leader
And partially that he was a cosmic bad-ass in Ep IV and Ep V. And then his character was assassinated by Lucas in Ep I-III.
Think what made Vader so effective a villain was the mystery behind him, who Anakin Skywalker was before his fall. The original trilogy built him up as one of the most powerful Jedi ever, a great and honorable man. Then Lucas seemed to decide decades later “Kids want a whiny, angsty protagonist! We’ll turn the most badass villain ever into an emokid!”