Sue Sylvester, 'Glee'
This character went from the best scene-stealer around to, well, almost the best scene-killer. It's no surprise Jane Lynch won the Emmy for 'Glee' season 1. 'Glee' season 2? That's another story. The character has gotten more and more absurd and cartoony. In fact, it wouldn't be surprising if Ryan Murphy and co. actually did an episode with an animated Sue Sylvester. By giving her so much to do, and trying to top each stunt, Sue Sylvester has become a burden for 'Glee.' That's not to say that every scene and episode with her is horrible; it's just a balance issue that needs to be rectified.
Pierce Hawthorne, 'Community'
The rest of the characters have meshed so well, it's often very easy to forget Pierce is a part of that beloved study group. He's a villain the show no longer requires. The other characters on the show don't like him, so why should viewers? The character sticks out like a sore thumb, not even remotely likable like equally disdained Jerry on 'Parks & Recreation.' Pierce scenes are often unfunny and heavy on the nerve grating.
Grace and Zach Florrick, 'The Good Wife'
Nothing slows the plot down on 'The Good Wife' more than Alicia and Peter's kids. Yes, being mother is an important part to Alicia's character. She's fiercely protective of her children and that's part of the reason why we love her so much. But when the kids are on their own, whether it's finding religion or dealing with a troublesome girlfriend, they really hinder the flow of an episode.
Pete, Frank, Toofer and Lutz, '30 Rock'
More often than not, when the writing staff (Pete, Frank, Toofer, Lutz, etc.) on '30 Rock' get their own plot ... it's pretty unnecessary. There's nothing worse than the times when you're enjoying a great Liz Lemon story and then BAM! Lutz and the rest have some sort of nonsensical scheme. They can throw the flow of an episode off like no other. As background characters they work, but not on their own.
Ann Perkins, 'Parks & Recreation'
Oh, Ann. Poor, sweet Ann. When the character hangs out with Leslie and the two enjoy their wonderful friendship, she's great. However, when we're forced to endure Ann on her own opposite Andy or Chris, everything is not so great. The character works so well when palling around with Leslie or being made miserable by April; it's when the writers set her off on her own romantic exploits that things begin to drag. An easily remedied situation.
Joel and Julia, 'Parenthood'
Out of the whole Braverman clan on 'Parenthood,' Joel and Julia are probably the most boring twosome. Viewers have been given no real reason to pull for them as a couple, which is needed because they're so mismatched. Their problems (before the fertility issues) weren't gripping, especially compared to the juicy drama the rest of the family brings to the table.