I'm kinda curious about those RPG's too, what made you not like it? I was hoping Tales of Graces f would be good since they're in the same series.
NO! Don't play Graces F or Symphonia 2 - they are both god awful additions to the Tales Of series. Graces F may have appealing gameplay, but its story and characters are so bad. It's literally just playing the first season of Yu-Gi-Oh - all about friendship and shit. Symphonia 2 has the worst Tales Of main characters - Emil doesn't do shit and Marta is honestly my least favorite character in gaming.
In general, the three best games are Vesperia, Symphonia, and Abyss.
Play Vesperia if you want amazing gameplay with a badass main character and a decent story.
Play Symphonia if you want an amazing story, great set of characters in general, and decent gameplay. .
Play Abyss if you want amazing character development, great story, and great gameplay - although this one takes the longest until shit starts to go down. The first 15 hours aren't that great, but after one event, everything changes and the game gets really good. Similar to Madoka or Steins Gate if you've seen those - nothing happens for a while, and then shit starts to go down. Since you like Persona, I'd recommend Abyss the most, as it is the one that has the most character development - though not as deep as Persona's social links.
Xillia is pretty good, but honestly nothing touches Symphonia, Abyss, and Vesperia. Most of the Tales Of fanbase agrees with these three being the best you can get out of Tales Of.