RPGamer is an older site and I wouldn't be surprised if this review was written in the late 90's. The thing about American gamers who contextualize RPGs as in which is the best for its time, the best ever, etc. is that a lot of these games weren't available in America back then. Final Fantasy fans in the US could only have played half of the series up until 1999.

It doesn't matter if any games have surpassed it since: Final Fantasy VI wasn't even the best RPG on the SNES. Chrono Trigger, Dragon Quest V, and Tactics Ogre: Let Us Cling together were far superior in terms of the scope of their stories and their mastery of gameplay.

Don't get me wrong, Final Fantasy VI is a very, very good game. It has some of the most epic moments ever in an RPG, awesome menu-based combat, a deep customization system, and some incredible dungeon design. Its original Japanese script was considerably mature for its time and paved the way for the more "adult" RPGs we would see in the Platinum Age of RPGs on the Sony PlayStation. But there's enough problems with the game to bring it down a few levels, even below some of its contemporaries.