Very interesting.
I don't think you can deem it format specific bias without comparing other systems though (which I saw in the Vita cult thread you plan doing) as I know in the cases like GameSpot, they just seem to enjoy giving popular games low scores for random reasons.
If we find a site that generally gives below the meta ratings on games on one system, then above meta on another system, that would then start to suggest the reviewers favour titles on a specific system. Whether that translates to bias against a system, or software preference on a system would be difficult to prove either way still.








