Under The Dome. Terrific Stephen King epic, with a huge cast of characters, including one of his best villains, and I was really looking forward to the series.
It opened okay, and they did a good job of showing the Dome coming down, but a few episodes in they introduced some weird supernatural nonsense that didn't exist in the original, and I was out.
It really pissed me off. It was a great story, all they had to do was tell it, but they had to get "creative" and fuck it up.