I don't get it either. Every now and then I get an rpg craving which results in the purchase of Golden Sun, Lord of the Rings: the Third Age, or Blue Dragon, which results in the additon of five pounds and the loss of a month of my life. Then the games are forgotten, because, objectively, they suck. Turn-based combat is stupid, and the only thing that's fun about it is the particle effect explosions onscreen, seeing a god beat up some poor sap on your behalf, etc.
In terms of story, jrpgs are so stagnant, static, and laughable that there is simply no metaphor to accurately describe it. There's a hero, a sidekick, an antihero, an idiot, a stoic, a scarily un-subtle comic relief character, and, above all, a naive high pitched girl wearing as close to nothing as humanly possible. This. Almost. Never. Changes.
There are never original reactions to plot devices. There are never unpredictable plot devices. There is more bad acting than there are pixels. I would even go so far as to say that the best jrpgs are the ones without voice acting, because at least then you can project appropriate emotions onto the text you read. Good god I have to stop this I'm pissing myself off.