It's mediocre to okay depending on your standards. Emil and Marta aren't great protagonists, the ToS1 cast shows up in a limited form, and the story isn't as good as ToS1. Gameplay is decent but stuff like the monster system could have been better executed, which they do in a later Tales game. People also dislike the lack of a world map.
Just remember it's basically a spinoff (they only gave it slightly more budget when they realized the Wii was selling) that acts like an extended epilogue and not really a main title otherwise you'll be heavily disappointed.