This never gets old for me. Evan Miller has a post (a bit older, but what the heck) on How Not To Sort By Average Rating. The point he makes about amazon absolutely infuriates me – please skip all those 2-review rankings that loved their cousin’s whatever. Give me the ones with more than 100 reviews, please. His solution is a bit tough if you’re not coding your own web page. But its still worth a read.