It's about 75% true to the original, at least insofar as I recall from catching episodes in my early childhood. Assuming there is/was source material beyond the TV programming, I'm unfamiliar with it, to be fair. Overall, it just seems like a darker, edgier version from the original TV programming. I do not recall Judy's character being so prim and exacting, necessarily. I also do not recall Penny's character being so obnoxious, almost a "Dr. Smith junior" of sorts. The West character took his time getting introduced and felt somewhat forced, like what reason do these folks really have for aligning themselves? The plot lines around which just feel sort of manufactured. And then there's the penultimate Dr. Smith; not quite "evil" in his (or her) intentions, but definitely "chaotic neutral" if ever there was one. I do not recall many of Posey's characters along these lines, but the little that I do recall, it seems more of a reprisal of her characters from prior works. Then there's the "strong female lead", I'm having a hard time believing Molly Parker's character in Maureen. Some of that is my bias, I suppose, having observed her performance in the U.S. version of House of Cards, to be fair. Still I think the sexist trouncing of the "supporting" male lead role in the Toby Stephens John character is unfounded and unjustified, all things considered. All that being said, LiS is LiS; perhaps 60-75% overall true to form. Maybe it was time for a remake, maybe it wasn't? Time will tell...