I can't agree with the last review at all. Yes, the main characters that are not dolls aren't quite what you would call well-doers, but they ARE characters. Which is something you'll miss in many many other TV shows, that only display shallow pretty puppets. It might not be the best TV show, that Whedon created so far and it was certainly ok that it ended after two seasons. But that really doesn't mean, I didn't enjoy the first two seasons.
Ok, that being said: I dearly love Fran Kranz as Topher Brink ( I also do love him in "The Cabin in the Woods" ) His immorality and beginning doubts shaking him to the bones until he becomes kinda crazy. It's awesome to watch. The same goes for Adelle DeWitt. It's wonderful to watch how unsure she becomes about everything.
I always loved Eliza Dushku as Faith in Buffy, but she doesn't really do it for me in Dollhouse. Strangly that doesn't change my feeling for this TV show at all.