How rad would it have been if they had cast Christopher Lee in the movies? What if they gave him a character with an interesting backstory and not use him? Give him ten minutes of screentime. All he does is stand, walk around, or flip around. That sounds rad. That’s a character I can get behind. Someone who’s only tangentially related to the plot or any of the main characters. That sounds awesome.
Christopher Lee didn’t deserve what he got.
And imagine if Dooku had remained a rogue Jedi who really was fighting to dislodge Sidious from power. So much could’ve been done with such a character. But nope, secret Sith apprentice. Yawn.