In my particular edge case, it was the other way around.
I missed the start of Lost, and by the time I was interested everyone said “Uh, it’s not going very well…”, so I spent zero hours on it.
Prometheus, well… I loved Alien, and so I watched Prometheus until I couldn’t stand it, then I watched some more. And I kept going and going and going, through all the shite, determined to watch for as long as a human reasonably could. I lasted a total of 55 minutes. Yikes.