http://en.wikipedia.org/wiki/Interactive_Achievement_Awards#Game_of_the_Year Those are love of your life type of games. Requiring constant updates to keep up with the competition... a thing can only get so much plastic surgery; if it has a rotten spirit to it, it will eventually be put aside.
I can play Morrowind, Oblivion, and Fallout 3 currently unmodded, but it is the mods that make it seem like a fresh and new experience when I play today. I love the games and have them all on consoles to enjoy the vanilla content, but it is the mods that makes me still buy a new copy of Morrowind when I loose my old one. Saying it is less of a game because it has such a level of personal customization is a pretty biased view even if it can be understood. To go off of your example of FFT which I have played through twice, I loose interest after 30+ hours and leave it for years before returning. In TES I can play for 30+ hours, add a bunch of new content and play for another 80. Then repeat that every year and get far more playtime out of it.