Yeah I agree on all accounts. I still enjoy that Jabba sequence too, and I loved Leia in the slave thingy...
I know, you're right. That was a major disapointment. I am STILL waiting to see Darth Vader hunting down and killing Jedi! Not that I favour the Dark Side, mind you, just that it justifies the story; Vader "helped the Emperor hunt down and destroy the last of the Jedi." That just BEGS for a killer series, where heroes rise and fall, building the evil and destructive elements of Vader.
Lucas sure is strange. He doesn't want viewers to see Vader cutting down Jedi, doesn't want them to see real alien-looking worlds ... yet he wants to show them three-year-old humour like robots looking to each other and going, "Uh oh" instead of getting out of the way of a falling elevator. Either he aims that humour for three-year-olds or that is just his level of humour...
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It is good to have an end to journey towards, but it is the journey that matters, in the end.
-Ursula Le Guin