The episode was pretty good. There were some awesome lines, I loved Rachel's "SPIES!" her delivery and face was so funny, "...and Tina" was hilarious too :lol And of course Sue's evil laugh! Priceless!
Puck is eh, he looks 30 and acts 12... I don't like him but his relationship with Artie is cool and I really liked their song.
Glad to see Sam's abs again <3 (DMPrince, I love you for that gif :lol ). I'm also really liking Finn much more this season. Love Biestie, she's awesome and I really felt bad for her.
Blaine is hot. Like, super hot. He's likable and has a good voice, I hope to see more of him. Speaking about Blaine, wth Kurt, having a picture of him already? How stalker-ish of him :lol and they went overboard with the "courage" part, it was cheesy. About his storyline, I thought it was pretty good and I didn't see the kiss coming at all. It felt awkward to me when it happened.
I think I liked the girl's mash-up better but I'm biased since I love "Livin' on a Prayer".