what i liked- the ending, everyone loving the new Brian, Stewie making the comment about that lady's leg (after Quagmire just told Brian not to), "cool hwip", "I'm going to make you a little less gross each day", Stewie washing Rupert in the shower, Stewie murdering new Brian after discovering what he did, Stewie saying that Brian is "my douche", the karaoke scene, etc.
good episode. i really liked it. New Brian was an interesting character, and it is in a way, kind of sad to see him die, but oh well. They obviously had to do something so that Brian could return, and they worked well (Stewie dragging trash bags and blood dripping is dark, yet kind of funny in a way). Good episode, B- or so is my final grade.