I do think, however, that the more complex background should make I and II somewhat different from the other films. Those films were set up with good vs. evil and the rebel alliance was small and focused on narrow goals (hence relatively few central characters). We knew the Empire was evil and didn't have to know how it got there or that way. And that was enough. Since I and II deal with a polity about to enter a civil war, I think a few more details about what is going on would be helpful. And could help improve the story. The trade war in I was not well treated. I am not saying that these things should simply make the plot more complex or detract from the Anakin story. But to create a greater sense of the workings of the Republic and the political intrigue that is going on would help the story and contribute to the consistent feel (of impending crisis?) I felt was missing. A shot of chaos in the Senate, groups of Senators arguing some point in the background, more references to other recent crises, a few references to the Republic's governance arrangements, etc., could suffice. The earlier films were very busy with all sorts of aliens and activity in the background. I and II have less of that, but their place could have been used to partially flesh out the larger background against which the central story is being told--with the aim of supporting rather than detract from the main plot. As someone else pointed out, these and the dialogue problems could be addressed by an outside director.
While I think these films require a different touch than IV-VI, there are precedents in literature and film that could be drawn on for these--as Lucas drew effectively on other precedents previously.
Mostly, I was disappointed because I wanted to be much more entertained than I was. I doubt I will ever watch I or II again but will probably return to I, II, and the opening part of III many times in the future. I was all the more disappointed because I felt these problems could and should have been overcome given the effort that went into them.