Not to take away from Ian McDiarmid’s work in Jedi, deliciously wicked as it was, I sometimes find his emperor a little too obviously evil in the overall context of where the story was coming from. It would have been rather interesting to see the final showdown as more a battle of wits, illusion and manipulation with a slightly charming, non-cackling Emperor. Ironically, he gets closer to this in the prequels before he gets electrifried (in an otherwise painfully dull trilogy).
+1