It is a much better game, the cast is more enjoyable (i hated most of the cast of Symphonia) and dungeons & battle are fun this time around, also there isn't a character that keeps getting kidnapped the whole time.
I know symphonia is so beloved, but i liked Abyss way more... Luke was annoying but that had a purpose. Zestiria's plot is simple but you can feel that it was made with love, it talks about very positive things without feeling dumb, i can see how this game could help some people beat depression and such :>
Played 25 hours or so, and for me, right now... for those Tales of i played a lot since the GC-PS2 era...
Abyss >>>>>>>>> Vesperia >>> Zestiria>>>> Symphonia>> Xillia >>> Xillia 2 >>>> Legendia >> Graces F
So the best one since Vesperia, an step if the right direction, everything new they attempt is refreshing, the overworld, dungeon design, how quests and the content is managed... the only bad thing about this game's gameplay is the fusion system imo :> if Berseria has Zestiria as its base and improves further we'll get a pretty good game and could be awesome if they manage to pull another Abyss-like plot. Oh, and we also got an awesome OST after ages