Editors edit reviews all the time. It's their job, especially if they feel the reviewer isn't giving the game a fair shake.
For a frame of reference, this NEVER happens here. I may ask a reviewer to go back and quantify why they felt so strongly one way or the other but we never edit reviews in this fashion. The review should reflect your experience, not be tailored and doctored to fit an agenda.
Do you use freelancers?
I have a bunch of issues with the Gamespy case and how they handled it but the core issue was that the Gamespy staff (or at least those that had played at least some of DK2) felt that the game was better than the freelancer did.
Tom Chick's rather infamous review of Deus Ex is one of the more notable instances of this happening. He didn't like the game very much and reviewed it poorly. The site he was freelancing for, now-defunct Gamecenter, felt differently- they thought it was a really great game (as did most others) and didn't want to let the review effectively become Gamecenter's official view on Deus Ex. In that case they handled it far better than Gamespy though- they paid Tom his "kill" fee and and had someone else review the game. Tom was ultimately able to get his review posted on Games Domain as a second opinion.
Gamespy borked the handling here completely but I don't have an issue with the principle of a site and its staff determining if they want to let one reviewer's opinion stand for the site as a whole.