[JoeAltmaier]

But some 10's and 1's are lazy indignant people. Putting an obstacle in the way of registering a rating could filter out lots of noise. Leaving people who deliberately, intentionally review movies. Those ratings would be of an entire different class.

[lyndonh]

But surely they don't use the mean to find the average score ?

Even a basic trimmed statistic would find a much more accurate average. Lazy people leaving 10s and 1s would be removed or given a lower weighting.

[Retric]

As long as it's consistent such ratings are averaged out as a 8.2 is only meaningful in comparison to other scores.