loved this episode
It's funny to see kurt back, because he's got a new confidence from being at the other school. I just loved his songs and especially his dance moves.

I also thought that the song they sang for his departure was good, I didnt realize that rachel and "quinn" (hahaha!) were singing I feel pretty from west side story until the chorus... That was real re-appropriation of the song. I also loved that they all danced on duck sauce. It was awesome!
As for the last song it was great too, I never really paid attention to that song but hearing it from the glee cast and actually listening to the words, I really liked it. And the whole thing with brittany and santana was touching. I look forward seeing the evolution of that, and the OCD thing with emma.
(and I have to comment on Mike's tshirt, I thought it was too funny! In that scene I thought Tina did a good job and obviously Brittany) (oh and the whole hidden story behind Quinn was kind of secondary and easily not useful to the story but it was a surprising turn

)
Hope we'll still see Darren as much, I love his character and Darren is handsome and charming...

(sorry, I'm all over the place, I just saw the episode

)