Now I took in and completed all of Dark Season 1, 2, and 3 in a matter of 4 days and I still had to consult various Wiki/Fan sites to validate what I thought I saw is what happened.
As everyone else has said, too much jumping around between different characters etc. I think Dark would have and should have had a good portion of telling the story in a logical procession. They sort of did that at one point but it was all of what, 3 minutes? Give me that fully encompassing perspective of Jonas A, then Jonas B, then Martha 2 A, then Martha 2 B, and then a few revisions of Claudia for complete coverage.
This is where Steins;Gate did substantially better in telling the story. Even if you factor in Steins;Gate0 for the sad alternate complicated perspective.