Season seven finale.
I'm getting really tired of these now obligatory 'inevitable downfall' angles. Sopranos, The Shield, Breaking Bad, etc.
Nothing says an anti-hero has to be successful 100% of the time. But that does not by any measure mean that he or she must or will be tragically fated--or even that the people around that person are doomed in some way or another.
For some reason, the writers felt compelled to drag Debra into a world not her own. But it wasn't by necessity. It just seems to be a new trend to create a downward spiral for the characters involved, and it just sucks all the motivation out of the audience to even bother watching.
I've kinda forgiven the show for Rita since I found out that the actress was simply leaving for another show and they had little choice in how to handle it (of course I don't give them a pass for not actually looking into her murder or giving him a gallery of love interests). But destroying Debra's stability as a character just for an obligatory downturn is unforgivable.
A big issue with Breaking Bad at the moment is its audience. People have less of a vested interest in bothering with the final season because Walter has become a person no one can relate to. While it was interesting to watch him as an unlikely criminal, his new ruthlessness as a drug lord has made him boring. And that's exactly the fate Debra's being condemned to as a character.