I'm currently watching the early episodes of the first "parallel time" storyline, the one set in 1970. This was the period when most of the "A" players in the cast - Barnabas, Julia, Elizabeth, Roger, Carolyn, Maggie etc. - were off filming the first "Dark Shadows" movie. As a result, the story is forced to rely on many of the second-stringers to take up the slack. The only exceptions are Quentin and Angelique, who have prominent roles in this section. Otherwise, Barnabas is locked in his coffin, Julia (the servant) has been sent away for a "vacation," Maggie has fled to her sister's, and Carolyn, Elizabeth and Roger make infrequent appearances if they show up at all.
Thanks to all this, I'm afraid this section contains what is, for me, the single worst plotline in all of "Dark Shadows" - the Jeckyl and Hyde ripoff involving the repulsive John Yaeger. That story is sooooooo tedious and boring that I can barely get through the episodes. I wonder if the show lost a significant percentage of its viewership during this arid period.
I can't wait for the key actors to make their way back and get the story rolling again.