As the Adventures in Leviathanland draws to a close, its principle failure for me is the lack of any real screen chemistry between Nancy Barrett and Christopher Pennock. Someone else must have thought so too, as they are never paired romantically again.
All of the core Leviathan cult members are killed off. Elizabeth (and presumably Amy and David) are given very selective amnesia. They appear to remember Jeb but have no apparent recollection of anything they did on his behalf.
The show rebounds very well with the parallel time story. Dark Shadows is once again, as has been posted before, a story about a family. True, the Cyrus/Yaeger stuff lacks cohesion but the Tomb of Ligea/Rebecca elements are a new twist to the formula. Lara Parker does some of her best work as the true Alexis Stokes and I was genuinely sorry to see her go.
The 1995/1970 starts off so well, establishing the threat of impending doom. Somewhere along the way, though, it just loses that.
And, after that, it's everything including the kitchen sink.