I think there is value here, when it comes to products or restaurants.

For example, u could do a weighted average, that at a glance shows u relevant information.

Instead of having each review/rating have the same weight, one could give more importance to your follows.

e.g. your follows have weight 1. npubs 2 hops away have weight 1/2, then 1/4 and so on. The idea is that people closer to u will have an opinion that is probably more relevant that people far away from u