I don't think the subtitle is refering to what FF8 is, as much as what it tried to be. I do think FF8 was intended to be the most emotional FF to date. It was dubbed a romance after all.
Assuming for the moment that the subtitle is refering to the game as it is, then it should be accepted as oppinion. Any statement involving words like "captivating"- especially when paired with "most", can be nothing BUT an oppinion. There is no means of judging a game's "captivation". Thus, I wouldn't worry about the subtitle.
