Then that makes no sense "current state of technology" what is your baseline? which camera do you compare it to? what makes any of the scores relative? if this is there rational then the numerical score is meaningless, you never shoot at a moving target because you never have a baseline to compare?
The numerical score isn't everything in a review. You have the comments and the comparator widget of the studio scene and you ave sample pictures which you could download. Would it make more sense to you if the GH3 got five points better than the GH2, but then three points less than the E-M5 which is on parr with it if not better.
BTW, the score corresponds quite well with what users are sharing here : many GH2 owners are reluctant to upgrade the GH3 or went over to the E-M5.