The thing I like about GHOST WHISPERER is the way the writers change up the tone of the episodes. Some ghosts have been miserable, sad, lost. But others (I remember a baseball player from last season) are highly belligerent and thus the show takes on a much more grisly and hostile tone.
I'm sure the actoirs prefer it that way, too, as they aren't forced into repeating the same emotions week after week.
I did NOT like Camryn Mannheim's rather unnecessary chiding of Melinda and her visions. I was glad the writers gave her a comeback to her later in the episode. (Actually, I wouldn't mind at all if Camryn got written off the show. Other than holding down the fort when Melinda's off on an adventure, I don't think she brings much to the program.)