I'd separate visual continuinty, and plot continuity. PT is a total mess in almost every way.

Visually I admit that has some great points, and it wouldn't bother me if some PT elements were re-introduced in the OT. Particularly some republic ships at endor, both for the Empire and the Rebels. Also, the city of Coruscant should have its place at the OT in my view too.

Plot wise, all the PT elements that don't match the OT are in disadvantage, mainly because they don't have a reason to be, leading to a conflict in which one cannon, PT or OT will have to dominate the other. Changing Shaw for Christensen symbolises the thriumph of PT against OT plot, because it means the introduction of a non OT plot element (the force ghost preserving their last "good" appearance) in the very core of the OT.

This said, there are other changes that need to be done to the PT to make the movie watchable and believable. If you want to make a movie believable, even if it has aliens and 1000 stores buildings, you have to make the characters likeable to allow the spectator to identify himself with at least one of them. It doesn't happen (at least to me) with not even one of them, except Palpatine who is the only one that seems to have more than two neurons. Strenghtening the characters doesn't necessarly have to be a process that also comprehends matching the OT plot wise, you can do A, B o AB. Personally I found the whole strenghtening of the character the pivotal point of a good PT fan edit.

It doesn't matter if ObiWan didn't do what he said he did back in the OT, what definetely matters to me is that ObiWan, the wise and tricky old man is the same man in the PT, that is what gives continuity to the saga; and not him being some stupid legalist jedi, pure shell and no content.

Greetings!