By now you know the Deathlands drill, or have been ignoring reviews of the series and will ignore this one too. The main things that stand out about Shadowfall are the introduction of a new ongoing antagonist (a mutant hypnotist who collects hair, nominally for the sale of wigs) and the inversion of the usual formula, where the ruling baron of the area is typically a power-hungry sadist and tyrant who needs to be toppled.
A thing I found interesting is that this was one of the few places where… let me back up. See, Krysty (the redhead who can sense the limited future enough to warn of impending doom, or else have a good idea of whether her friends are safe or not in real time, over long distances) has been wanting Ryan (her boyfriend, the one-eyed leader of the traveling group of… heroes? mercenaries? I guess ronin would be a pretty good analogue) to settle down somewhere pleasant and make babies. The thing I found interesting was that this was one of the few times since she’s wanted this that they voluntarily left a locale where settling down would have been feasible, and she didn’t say a single word about it.
The thing you should find interesting about this is that the lack of consistent characterization is a noteworthy outlier.
 Power vacuums are not really a problem for our heroes, since they will be teleporting somewhere else by the beginning of next book at the latest.
 Appropriation being what it is, I should first note that this is my assessment, nobody has said anything like that in the books (not that they wouldn’t, because really, this is mid ’90s authorship, but they didn’t), and second note that I really can’t think of an American cognate for ronin. The only thing close is some Westerns tropes, but most of those are lifted wholesale from Japanese samurai / ronin stories and dressed up with six-guns and leathers in the first place, so you see my problem.
 There have been hints in fact of some probably but not definitely Japanese people popping up in weird places and slaughtering folks, which I expect to pay off in a book or two (and which may be what put the lordless samurai comparison in my head in the first place, come to think of it). None of this would be relevant, except that they’re being referred to as Orientals, which by 1995 really should have been out of common usage. So that’s been an annoyance.