Almost nobody was an acting improvement over the original
Except for the lady playing Angelique here (original Lara Parker really was not a very good actress at all--she admitted it in books). Lysette Anthony could act.
Everyone else--inferior. I like Jean Simmons just swell in "Blue Lagoon" and "Elmer Gantry" but she was just spiffy as Liz (like the way she played a Princess on an ep of TV's Odd Couple) and not much more to match the far more appealing and intense characterization of more respected movie queen Joan Bennett.
Merely adequate Jim Fyfe would never take off as well as Willie Loomis (John Karlen--perhaps a too serious actor in general--was however brilliant as the original freer of Barnabas).
Joanna Going very pretty but only honestly mildly interesting as Vicky. Beauty Alexandra Moltke was way more ultra-memorable as the original Miss Winters.
Lastly (in my comparison) Barnabas. While Ben Cross was indeed very, very good as the vampire central figure he had too much assistance from the director, the expensive production of the series and so on. His Barnabas too much a senseless monster at times reminding me of the creatures in 1981's "The Howling" (starring Dee Wallace). And still he could not 100% exude the terror of Jonathan Frid's excellent, deeply petrifying original in the low-budget original.