As a genre, jRPG's are niche. A couple of franchises managed to break out in the West, like Final Fantasy, but in general the appeal of jRPG's is much more limited than first person shooters, racing games, action games, platformers etc.
And I'm sorry, but it is possible to exercise our judgment in determining what games have limited appeal or not, it's not just 'what I don't like' or what I percieve to be unpopular but not based on popularity (?). As soon as I saw Madworld I could tell people would be turned off by it. My favorite games are games like X3: Terran Conflict, space sims with an empire/economy side to them. I know full well that game is incredibly niche, even though it's my personal favorite.
A game I'm developing with some friends:
www.xnagg.com/zombieasteroids/publish.htm
It is largely a technical exercise but feedback is appreciated.