Glee's episodes have gone to varying highs and lows over the season. We've seen complaints about pointless episodes ("Britney/Brittany", anyone?) ridiculous plot twists (Sue marrying herself, anyone?) and gratuitous references. But we've also seen praises for thoughtful storylines (like Kurt's reactions to Burt's illness), good musical performances, and the usual quotables. So let me ask you this: What makes a good Glee episode? What have you always loved about the show, and what left you going "ugh"? What should the writers focus on, or get rid of?