Best Rating System: Reddit-style or Amazon-style?
mattmcknight: The Amazon style is potentially better because it is naturally normalized by the number of raters. It is useful to augment it with a number of raters so that there is some weight given to sample size (4.5 stars by 2 raters might mean less than 4.12 stars by 283 raters).  I actually enjoy seeing the full distribution with Amazon as there are many polarizing items that have lots of fives and ones, but show up as three. It may also be useful to weight the ratings by age when ranking, as things change over time, some sites and content become less authoritative, others improve.