S1, where it's more a comedy, might be my favorite. there are some parts especially in late-S2, early-S3, and early-S4 where the show can get really dark/pessimistic and kind of grind to a halt.
but there's never a significant drop in quality and the stakes are very high. fascinating show with top notch acting and writing.
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I'm always serious. Otherwise, no one will take me seriously.