"A Very Glee Christmas" focuses some of the more unrealistic elements of the show--Sue's pervasive mean-spiritedness and Brittany's near insanity--and it's all pretty silly. We're supposed to believe that Brittany is so oblivious that she'd still believe in Santa, discounting every shred of logic behind his nonexistence. Sue is more Grinchy than usual, actually dressing up as a Grinch and destroying the tree and presents at the school for no reason other than to cause trouble. Predictably, the episode ends on a happy note as everyone gets together at Will's house to spread some holiday cheer.
There are also a bunch of random subplots jammed into the episode. Finn officially breaks up with Rachel, Will decides to stay away from Emma, and Kurt shows up at the beginning of the episode for a song and then disappears.
At the end of the day, we have to remember this is a Glee Christmas episode. The combination inevitably results in an abundance of Christmas songs, a warm feeling in the end, and a thin plot surrounding the Christmas theme. "A Very Glee Christmas" fulfills the criteria and that's what anyone expects.
Score: 8.3/10