Murder House. Coven would've taken the title, but the fact there are only two episodes left and Zoe, the supposed main character, is easily one of the least developed characters of the cast, and yet
she's probably gonna end up being the Supreme.
Like, what on Earth?

Terrible pacing and Zoe's awful character development are the two main reasons why it's not the best season.
I haven't finished Asylum yet, though. So maybe that'll end up being my favorite (I doubt it, though, although so far so good).