The only thing I liked about that character was his last scene where Kate told him he was a lousy lay.
I agree the show could have done more with Robin Strasser. Sometimes I wonder if Robin's whole look and persona were too intimidating for getting on established shows for longer runs, although the main culprit was probably just ageism and sexism, or in the case of Knots, already having so many women in that age range.
Good as Kathleen Noone was as Claudia (early on, anyway), I wouldn't have minded seeing Dianne put into Greg's orbit instead to fill some of the same purpose.