Amazing series, probably my all-time favorite. Walter's character is brilliantly developed, and what I found amazing is the credible portayal of a smart man who has to deal with unexpected problems. He doesn't have a magic staff, but he is usually able to use his intelligence to find a solution to the problems he has to face. What's brilliant is that you can see or at least reconstruct his thought process (no "magical deductions" à la Sherlock Holmes) and very often things go wrong beacause of something he didn't know or couldn't predict, pretty much as it happens in the real world. Despite that, he never gives up and looks for a better fixing (with all the most catastrophic consequences).