Good Questions, I like walkthroughs that are good at explaining the setting, and making observations, so that, I can stop get a hint from it, before going through a step by step to do list,
I have also had the same experience as you, and left even more
frustrated when I still couldnt understand, how they come to the conclusion to do the steps...
would love to see more walkthroughs that set the stage, and give the inside workings of the mind that take you to the solution, I think I have seen alot of them like that at the game boomers site,
I love that most the walk throughs I only need a sentance or part of one, just to get me over the slump, sometimes its just pointing out how to look at what is there,and that gets me thinking, and solving the problem myself....
I appreciate the walkthroughs, they make games possible for me, I am not always understanding the way to go..