Anyway, you're talking to a guy here who thinks the Empire in Star Wars gets a bum rap. The Rebels are just a bunch of left-wing radicals running around blowing stuff up, without a viable plan for governing after they win. But I digress....
I've heard this position voiced (but I haven't heard much in details and don't care to look into it). It's only a movie... it's only a movie...
The Empire was a dictatorship (and certainly there were some power hungry people at the top).
I don't think that all planets should have to belong to a universal government (nor should all nations have to join a one world government).
There were Princesses and other unelected rulers in the preEmpire universe. Certainly things weren't great before the Empire but I don't know that they were a solution (what with blowing up planets to get people to talk).
I don't care for the story arch that closes out the series (films I-III coming after IV-VI). Chapters I-III basically are the arc of Darth Vader, who he is and how he came to power. Would anyone film a 3 picture deal about Adolph Hitler? Making him the hero of the first film using the old 1930s cliche of winning a race to save the family farm? In the second film he is more anxious but his blooming romance (and ties to the royal family are established, how do you think Princess Leia got to be a Princess?).
The original trilogy fare no better (ends with Ewoks). Empire Strikes Back was hailed as the best of the bunch but it ends with a cliffhanger. I say watch the original 1977 Star Wars and forget about all the rest.