Re-reviewing isn't unprecedented, I think some of the console magazines have re-reviewed based on receiving an incomplete build, or if features appeared late in the game.

Darkfall's re-review will probably be more balanced, but I'm guessing why Tasos reversed course on it is because one obviously flawed review is better than a review that is in-depth yet still negative. I don't think this is as big an issue as people think, E.G. had to deal with a huge reaction to metal gear solid 4 before, and they survived.