Tesla Tidbits created a "safety score" for judging FSD Beta:
He basically substracts points based on the cause of each intervention. 100 is a perfect score. 0 is a terrible score.
A - Collision Avoidance (15 points)
B - Attempted an illegal act (10 points)
C - Confused or would have confused other drivers (3 points)
D - Attempted an incorrect act (2 points)
E - I was not confident with the car's action (1 point)
F - Perfect drives (2 point bonus)
Formula: FSDSS = 100 - (100(A+B+C+D+E-F)/Miles)
Looks like a pretty cool score system for judging FSD Beta.