I agree that the episode was really good, it felt like the best one this season. I liked most of the mash ups, would have liked to have heard Gaga's You and I done on it's own though. Felt for Santana, Finn was such a douchebag to her in this ep. The Burt adverts with Sue were funny but Burt is such a pointless character these days.
Oh and Rory and Shelby are both getting annoying for me now, I hope they're not staying for the whole season.