I have voted for Whatever regarding the membership - one way I could think of would be to limit the membership to people you, in a way, know - trust can only be direct, because transitive trust doesn't work. (I trust Bob. Bob trusts GWB. Do I automatically trust GWB? No.)

Also, I voted for more people doing reviews - a) because we get more, differentiated opinions, and b) more tastes - for example, small, local groups, or even national groups which aren't known in the US.

Just my two cents.