Worst: 'How I Met Your Mother'
Here's a warning to TV writers: Never plan too far ahead. HIMYM co-creators Carter Bays and Craig Thomas reportedly decided early in the run of their sitcom that they wanted the hero Ted Mosby to end up with his ex-girlfriend Robin (Cobie Smulders) — even though they'd explained in the show's premiere that she wasn't his kids' mother. After dedicating the entire final season to Mosby finally meeting his lovable future wife, Tracy (well-played by Cristin Milioti), the showrunners turned her into a footnote; the episode revealed Ted's series-long story to have been about how he never stopped loving "Aunt Robin." That’s a twist that might’ve made sense if How I Met Your Mother had only lasted a couple of seasons. But after nine years of asking the audience to care about the identity of the woman in the damn title, the sudden about-face wasn’t just jarring. It was enraging.