Friends' average rating
In addition to the Letterboxd's user average, have an average score of only your friends rating.
David Merkle commented
Yes, what Quinton Moore said!
Quinton Moore commented
A friend or "people you follow" histogram under the histogram for everyone, would also be cool i think.
This would be a perfect implementation that already exists in some pages such as FilmAffinity and RateYourMusic, and makes a lot of sense.