Why do the majority of people think this game is the best of them all? Is it the time players got into the series?
It is the most popular (no, you don't get an arguably for this game), for rather obvious reasons. It was the first game released around the world, not just in Japan and North America. Obviously people would become enthralled by it. In addition, it also brought RPGs to the mainstream, as well as the Final Fantasy series. It isn't surprising that many people would have played this first, and enjoyed it as such. And, it often happens, the first one you play builds a nostalgia that beats any other game. Personally, it isn't my favorite, but it's up there somewhere.
The graphics looked terrible to me. The 3 characters in battle peeved me (until I grew into it.). The futuristic setting bothered me too. Almost all the people I know that say this is their favorite played FFVII first. They also pan FFVIII. I thought FFVIII was great! The people I ask about this say they hate the first 6 because of their "primitive graphics" and "lack of a materia system". I've finished FFVII once and was so disappointed with it I never played it again. It collects dust between the rather dust-free Final Fantasy Anthologies and Final Fantasy VIII on my shelf.
Well, that isn't much better than the people that think FFVI and below have bad graphics. FFVII did have standard graphics for its time.

All of the FFs have had technology.

And, you also need to remember, not everyone is grouped as a 'new school' or 'old school' or 'certain game' person. Everyone has different personal tastes.