Nicolas Cage: a data story.
One way to look at the variance might be to try plotting extremes instead. For example, plot the highest and lowest rated movie by an actor in a sliding 5-year window, with labeled movie points. (Even Cage isn't prolific enough to have enough movies in a single year to show a good min/max.) Overlay a few actors for comparison. Cage's two min/max lines will probably be usually be well below/above the controls. This would be more intuitive than some sort of variance measure, because you can see what the low/high points were: 'Cage's best movie in the late 2010s was the crazy _XYZ_, while Robert Downey Junior's best movie was just _ABC_, so even if Rob's average is higher, you can see why people might watch more Cage despite incredible stinkers like _DEF_ way down there'.
why you do him like that
The meme section should mention this dramatic compilation posted to Youtube back in the early 2010s. It's fascinating:
Nicolas Cage Losing His Shit
HODL nic cage