Roger Davis says on one of the MPI tapes (I think it might be "Behind the Scenes of Dark Shadows") that he was basically Dan Curtis' pet actor. Or something like that. I am always surprised he was so honest about that. It's very "Norma Desmond" (as in Sunset Boulevard) the way he says that, too--he's wearing this pair of designer sunglasses and removes them slowly, dramatically, and starts talking about his special status on the DS premises.
I actually kind of enjoyed RD's performance as Dirk Wilkins. I won't say anything to spoil it, but I think that character was designed to let him do something different and he was better at that than the leading man roles Curtis kept handing him. He did do well in the role of Jeff in hoDS, I thought, but again that role did not challenge him the way some of his DS roles did.
I will confess here and now that "Peter and Vicki" and their seemingly endless scenes together are a big reason why 1795 never makes my list of my top favorite DS storylines. There are whole episodes devoted to Peter and Vicki and their trials and tribulations, and in my not-so-humble opinion, they drag painfully.
Steve