Because as of recent, they suck.
I'm a massive JRPG fan, as some of my favorite rpgs from this generation is Resonance of Fate, Blue Dragon, Lost Odyssey, Tales of Vesparia and so on. But I cringe at the sight at anything made by Nis, Arc Rise Fantasia, and etc. Why so? Its because they feel TOO familiar. The protagonist look identical from each other, the stories seem to take place in a cliched environment, and to put it bluntly, they don't have a style of their own.
This can be applied to many games as well. most shooters seem to rip off Call of Duty or Fallout, most western rpgs rip off Oblivion and Mass Effect, and don't get me started on those bullshit shovel ware plat formers.
Alright, I'll just end this pointless post with this. I don't know about everyone else, but I hate games that are familiar. I prefer my games to have their own style, and be recognizable form the ocean of video games. Quite frankly, JRPGS and even most games are too similar. And when you play the same thing over and over, no matter what, your going to end up hating them.