If it helps, Metacritic has 20 reviews up now from critics. So, at least Gamespot isn't behind everyone else on this one .... oh.
I understand if they are waiting to verify any concerns or worries with online features (such as the MyCareer progression issue the 360 was having), but it seems like a review could have been presented simply making note of what they hadn't been able to reliably test yet -- and then updated once those features were adequately reviewed.
I trust Gamespot reviews more than any other site, and understand a part of that trust comes from how thorough they generally are ... but it would have been nice to see something. Unless I missed it, there's been zero mention of 2K13 since it's release date, now a full week ago.