Palpatine is a stupid villain. The character and the actor both are unintimidating and uninteresting. There's no depth in how he was written, and there is no gravity in his performance. Ian McDiarmid has the face of a slapstick comic relief character. That Palpatine has become the core of Star Wars above all other characters is really the final insult.
I totally see where you are coming from with that. But I don't think Lucas had much of a choice once he got past ANH and into ESB/ROTJ.
In terms of fleshing out a villain, Lucas had to blow most of that budget on Anakin/Vader. Then there had to be somebody else who was a whole notch more evil than Vader, for him to be seduced by and eventually rebel against.
I think it's impressive that Lucas had the foresight (or at least good instincts) to mention the "the Emperor" in ANH. That was before Lucas had really committed to making Vader be Luke's father (and thus, redeemable). Lucas was doing a pretty paint-by-numbers story in ANH with no serious plans for sequels yet. Standard procedure would have been to make Vader the king baddie. I mean, Skeletor doesn't report to a boss who is more evil than him.
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