Quoted from rai:I guess we are making 2 big a deal about this but instead of throwing out all the high and low ratings maybe throw out anything that 20% higher or lower than the average.
For example if something is at 8.0 than anything above 9.6 or below 6.4 gets tossed.
This just neuters your scoring scale and squeezes everything to the middle.
Doing things like grading ratings and weighting how they are counted like Robin has said he already does is pretty much the best framework if you are going to keep the principle of letting 'everyone' rate games.
This model allows you to do things like throw out that look like junk... and value others that meet metrics you set (detail, completeness, sanity, etc)