WRPGs are completely different than JRPGs in terms of gameplay, story-telling and art-style. WRPGs have more freedom & choices whereas JRPGs are more restricted, and the story is already pre-determined.
While I do like JRPGs, I do have my fair share of problems with them. The art-style in JRPGs has changed for the worse imo. I don't like the moe, cutesy, fanservice appeal most of the JRPGs are adopting. It's kind of a turn-off for me which is why I mainly stick with FF and SMT.
Also, they haven't really evolve in terms of gameplay. The Tales of games are pretty much the same for the past 10 years, and a lot of niche JRPGs like the Atelier series are still stuck in the past with a very basic turn-based system. It gets tiring playing a bunch of games that have the same battle system over and over, especially considering how long these types of games are. There's not much innovation, and not many are willing to take the risk.
Lastly, most of the story/characters are horribly written and sometimes end up convoluted. Look at Kingdom Hearts.