This debate isn't new, it pretty much dates from the time Final Fantasy II was released; as soon as they could, fans started pulling each others' hair over which game in this series deserved the "Holy Grail" award.
While most fans these days give this honor to the seventh game, quite a lot of fans still stand by other installments of the series, notably FFIV, FFVI, FFVIII and FFX.
There's a reason why this debate (just like the series) will never die: It's all about personal opinions. Just like music and clothings, video games are about personal preferences. Games are not a science, they are pieces of art, and thus are experienced as such. Some may hate Picasso, some think it's one of the greatest painters to have ever lived on this planet, and most just wonder what the hell is a Pick Ass Hoe.
Does everyone love Halo 3? I sure wouldn't have given it the game of the year award but some people (especially Microsoft) believe it deserves a 10 out of 10 everywhere it goes.
A game will never be universally acclaimed by everyone, it just can't be. Just like there will never be a single genre of music that will reign supreme. Of course there are some games that are more popular, and it's because obviously more love and effort are put into these games, but even games that seem almost flawless to some will leave a sour taste in the mouth of others.
Some liked Kefka (I sure did!), others prefer Sepiroth (boo!); there are so many factors beyond technical execution, beyond hardware limitations, that make games a hit or miss with players, that we will never reach a consensus about these kinds of issues.
Although we can certainly agree that not all games are equal, I'm only saying they can be rated on a 1 to 10 scale, but this will never truly determine if a game is a memorable experience or not, or if everyone feels the same about the said-game.