Most people who see the new movies won't completely understand what was going on in them. There were very deep plot lines involved in them, but Lucas played a lot of them down, I suppose, in favor of hyping the love story, and the actual action scenes.
Palpatine's rise to power was complicated, even in Episode 1. When you consider why the Trade Federation was really blockading Naboo, Palpatine's story becomes very deep.
The Supreme Chancellor Valorum sent the jedi as ambassadors for him, not ambassadors on behalf of the Republic. During the senate meeting, the jedi could not testify that the Trade Federation was actually doing anything wrong without incriminating themselves, and Chancellor Valorum, who was mired in accusations of corruption to begin with.
Thus Valorum was dethroned, and Palpatine has his path to power. This, of course is only one aspect of the story that was relatively complicated, and hidden from most movie-goers.
Episode 2 was riddled with even more of this kind of thing, but most people will discount the prequels as shallow brick-a-brack. The thing about it is, they not only brought in just as many new Star Wars fans as the old ones did, but they made the original trilogy 3 times as deep.
My point is, the more you understand exactly what was going on in these movies, the more you can enjoy them. Of course, the downside to that might be that you will have to do some research into the characters, and perhaps comics and other novels to understand much of this stuff. To fans, this should be no problem, for the casual movie-goer, I guess Lucas figured -- oh well...