I really like the concept of this episode. The idea of investigating one's _own_ murder has been done several times in fiction, but the dollhouse brings a new spin to it. And having it be one of DeWitt's friends is a nice addition.
I also rather enjoy having an episode without much of the overarching plot. Not that I dislike the season plot, it's just nice to have a standalone episode with a good story as well.
Aaaand Paul went down another notch in my esteem. What he did to Mellie/November is just not okay.