On the season-by-season heatmaps I said I wanted to find the shows that figure out when to stop. That page draws the maps but never actually answers the question, so this one does the arithmetic. Of the 61 shows I track, 57 have more than one full season and can actually be ranked.

The idea is simple. For each show I take the average IMDb rating of every season, find its best season, and compare that peak to where the show is now. A show that ended near its peak went out on a high note. A show sitting two full points below its best season did not.

The single biggest fall from grace is Game of Thrones, which peaked in season 4 at 9.25 and finished season 8 at 6.40, a drop of 2.85 points. On the other side, 16 shows ended their run on their own best season.

The fall-from-peak leaderboard

Bars are how far a show sits below its own best season. Shows still on the air are shaded differently, because their story isn’t finished. A dip might still turn into a comeback.

Shows that stuck the landing

These shows ended on their highest-rated season, as far as the episode data goes. This is the list the whole page was built to find.

The slow slide

The leaderboard above rewards one bad season. This looks at the whole trajectory instead: the slope of a straight line through a show’s season averages, in rating points per season. I only include shows with at least four scored seasons, because a slope drawn through two points is just a rumour.

Everything, all at once

Every metric for every show, sortable and filterable.

How this is calculated, and where it’s unfair

A few things worth knowing before you take any of this personally:

  • Seasons with fewer than three episodes are ignored. Otherwise a show two episodes into a new season would look like it had collapsed.
  • “Still airing” is a guess. I flag a show as ongoing if its most recent episode landed within the last year or so. There’s no cancellation data here, so a show on hiatus may be mislabelled either way.
  • Long-running comedies are punished by design. The Simpsons, South Park, and Family Guy all peaked in the nineties or early 2000s and have been running ever since. Comparing season 37 to season 7 is a big drop, but it isn’t really the same show, and “still on the air after 37 seasons” is its own kind of win.
  • Ratings drift with the audience, not just quality. Early seasons get rated years later by people who already decided they love the show. Finales get rated the week they air by everyone who’s angry. That asymmetry inflates exactly the drop this page measures.
  • A high peak makes falling easier. A show that never went above 7.5 has less room to drop than one that hit 9.3.

The episode data refreshes automatically from IMDb, so these numbers move on their own. The metric code lives in scripts/tv_decline_metrics.R and has tests, in case you want to argue with the arithmetic rather than the conclusions.

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