I built a feature priority and sizing app based on this for my team years ago. It worked very well technically, but it was a challenge to get people past their desire to drive the process with anecdotes and gut feels.

Bayesian approach to preference discovery using Xbox's TrueSkill algorithm. Instead of rating 100 items individually, compare pairs and let the math figure out your taste. Built to solve decision paralysis when buying jewelry, now works for any visual choice problem.