I can't put my finger on exactly why, but yes, Marcia's definitely got something unique. She may not have a Jessica Biel's body or a Jessica Alba's face, but she just oozes "sexy" in way most other celebs can't even touch. She's just got a vibe to her that says "I'll give you all you can handle and then some in the bedroom--or kitchen or laundry room or...)."
That first-season scene in the hotel room was the bomb.