On 1) I half agree, I don't think we should "have" to talk to everyone... unless all the important people stand still. If even one of them walks you may "never" find them.
On 2) I mostly agree, the light/dark thing should have been more vague and not always so cut and dried.
On 3) to a small extent it did, since some NPCs wandered from planet to planet and knew you, and some things did carry over. But not enough by a long shot.
Given that each "area" is a different planet, I find that this is more forgivable since it's not likely that a lot of change would occur given the distances involved.
On 4) Again, given that this takes place on multiple planets across a galaxy.... it makes more sense for things to be "completed" than if all the action occured on a single world.
On 5) agree wholeheartedly.
On 6) Haven't beaten it yet, but i agree with the context
On 7) didn't read it in case of spoilers
On Disagree, I see this as one of KoTOR's strengths and it greatly added to the immersion.