One thing in Battlestar Galactica was really, really bad. And no, I don't mean season 4 or the ending as I actually liked those a lot (although I can see why people would come to despise it or think its a bit all over the place). No, its the episode titled "The Woman King" in season 3 (arguably the worst season).
Just so others may know, its supposed to be said as, The Woman, King. As in, there is a woman named King. Not a bad point in of itself, just felt like stating it. No, the episode had HORRIBLE characterization. Characters that you know just started behaving vastly out of character. Helo tries to go through the whole episode helping a specific race of people that this doctor is killing, but nobody believes him because the doctor has done a lot of good things for everybody else. But its like, everybody's sole purpose was to just not believe Helo. No, they don't follow up on anything, they call Helo crazy and some of them even get up in his face and pretty much make him feel worthless. By the end of the episode, Helo does manage to prove that the doctor was killing those people, but its even taken as a "You were right Helo, but you're still scum, so shut up". And Helo accepts this with a smile. Doesn't call anybody out on how much they made his past couple of days a living hell.
The worst part though is that NO ONE should not be believing Helo. Even something he did in a previous episode which was deemed "questionable" and "stupid" by the other characters didn't justify treating Helo like crap. I think even his own wife was telling Helo to stop...his WIFE. The person who has gone through the most with him at that point in the show. Again, they hear what Helo has to say, and then just blow him off. But Helo is like one of 3 characters in that show who pretty much always tries to do good whenever possible (as in his "morally questionable" actions aren't as high as everyone else s). It would be like if someone you knew who always told the truth came up to you, but you just decide to not believe him at all. Yeah, on paper the episode can work, and it even deals a bit with racism among the fellow Humans. But maybe if that character was that woman King, or some random solider/citizen trying to get the main cast to believe them.
Ugh, that episode was so bad, and I don't think I'm even remembering it right. I think even the creator was like, "Yup, that was our worst episode" some time later. It didn't further the plot in any significant way that I can remember (even the other "crisis of the week" or "random one shot" episodes of that season did something), and if you are given the chance, avoid this episode like the plague.