I think they were mainly reviewing the port, which is good on some levels and bad on others. It's good in that a lot of people getting the bonus disc have already played OoT many times on the N64 and want to know how it's been improved for the Gamecube. It's bad, though, because a lot of people *haven't* played OoT and are expecting a review of the game itself rather than how it was ported.
I also like IGN's rating scale- their 10 out of 10 does not mean the game is perfect, it means the game is the pinnacle of development in that genre and represents, so far, the best efforts. Gamespot's 10 out of 10, however, DOES mean a perfect game, and they've given it out several times, I believe.