Beat me to it. Although speaking for myself, what put it over the top was the new crop of bland rips off of the other New Direction kids. None of them wre interesting, with the possible exception of Unique and Kitty got a few fans down the road, but I attribute that to Becca Tobin's own talents and not one bit on her non-existant redemption arc (seriously, she drives lame ass Marley to bulimia and the story is dropped like a hot potato? whatever). If they are never mentioned again, it'll be too soon.
7th Heaven: not that it was ever must see TV, but the first few seasons were okay until Jessica Beil quit and Brenda Hampton took her butthurt out on screen by making Mary the most Evil of Evils that ever Eviled. Add that the Camden house became a halfway home for every new teen that came on the show and Ruthie turning emo after her crush got another girl pregnant. Then, the faux-nale. I hope I get off deployment in time to save that thread, 'cuz the reactions to the renual were priceless.