I think you shouldn't do only a defined amount of review sites. But let user decide how each reviewer is valued.
Each user can give each reviewer (not review-> IGN 1UP etc) a score between 0 and 9. You can avarage that score and use it as multiplier for that source.
Something like that:
Lets say we have a Game G, and 5 Reviews to it:
R1: 9.0 (5.0)
R2: 9.2 (8.0)
R3: 9.5 (7.6)
R4: 7.0 (1.1)
R5: 8.5 (3.5)
The overall score is calculated like that:
(9.0*5+9.2*8.0+9.5*7.6+7.0*1.1+8.5*3.5)/(5+8+7.6+1.1+3.5) = 228.25/25,2 = 9,13.
That way you balance out bad reviewers. As for the submissions and verification. Well I say submissions can come from anyone, but verification needs to be done by trusted users. E.G. high post count/mods or chosen to do that without being a mod.
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