Right, but that's not the whole story. The 5 star system is probably a lot better suited to the sorts of things that Amazon sell (music, DVDs, electronics etc.

Right, but that's not the whole story. The 5 star system is probably a lot better suited to the sorts of things that Amazon sell (music, DVDs, electronics etc.). These ratings are not as time sensitive as a bar or restaurant ratings for example which could change entirely in the space of a very short period of time.