Seasons 1-5 of Buffy the Vampire Slayer.
I know, it sounds ridiculous. I refused to watch it for years, despite the fact that the critics were calling it the best show that nobody watches.
Turns out the seasons 1-5 were fantastic. Seasons 6 and 7 were garbage. Don't waste your time on them.
Along the same lines: Seasons 1-4 of Dexter. Seasons 5-8 were garbage.
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