WORST: "Grey's Anatomy" The "Glee" kids singing "Do They Know It's Christmas" almost got the nod here, but I'm giving it to the musical episode of "Grey's Anatomy," which was so tone-deaf it made even me, a complete and total Broadway show tune queen, hate the musical format for an hour. Apologies to Sara Ramirez, who has terrific voice. You just weren't given much to work with in this case. BEST: The "Regional Holiday Music" episode of "Community" delightfully skewered Fox's musical comedy "Glee," mocking everything that's wrong with the show from its overdone mash-ups to its obsession with Regionals--whatever those are. Not only that, but Dan Harmon and crew did so with original music. Too much fun.