I found Dark quite tough going at times, too confusing and too many threads. I battled to the end, but it was far from my fave series, and I do like the Time Travels genre.
You mentioned, The Time Machine. I have childhood memories of that one, I was enthralled.
Dark was confusing, but I got a lot of it by the end.
I've not seen the new Time Machine. I enjoyed the old movies like Journey to the Centre of the Earth. They may look a bit basic now, but those were simpler times.
I think I would still enjoy the original Time Machine now, was a classic.