It's true that the later games have an unfair advantage in that respect. However, that argument feels like a low blow. Whether or not the person using the argument has that intention, it ends up saying that the opinion of anyone who played FF7 before FF6 is worth less; it's very annoying to be told that your opinion is worth less thanks to chronological or geographical misfortune, especially when anyone who isn't looking at their side's supporters with rose-tinted glasses can see that there's no difference in average intelliegence, nor in ability to understand what makes a good game, good characters or a good story. It's even more annoying since it seems suspicioulsy convenient; after all, the argument also says that the opinions of people who are in a group that is more likely to like the older games are fairer, and therefore worth more, than those of people who are in a group that is more likely to like the "newer" games (i.e. the ones that came after FF became mainstream).
To show you what it's like, I'll make some factual points of my own. FF7 made the series mainstream in the West. It was also hyped as the "best game ever" around the time it was released and just before. These facts don't seem very annoying until one points out that fans of things that had previously been unpopular often react badly when it becomes mainstream, and that when a game is hyped as the "best game ever", an awful lot of video game fans decide that it's overrated before they've even played it (which isn't surprising, since the main demographic for video games is more rebellious than the general population).
From these facts one might infer that fans who started playing the FF games before they went mainstream are unable to properly judge the ones that came after it became mainstream, in much the same way that the facts you've stated imply that fans who played the later games first can'tjudge the earlier games fairly. However, all these facts do is confirm, to the people that use them, that people who disagree with them don't have to be taken seriously. I'm sure that if I had simply dived into the thread and stated those facts I'd piss off a lot of people and be accused of sophistry, or (as is more likely in these debates) homosexuality. The people who disgreed with me would see straight away that I was using cheap shots.
