I thought the Vesperia soundtrack was pretty pleasant, a couple of standouts but not much that really grabs me beside the Zagi battle theme "Distorted Sword Light" and Fury Sparks (which I'm kinda tired of by now, actually.) I hate the first battle theme, Furnace of War though.
Graces soundtrack is pretty weak. A couple of nice tracks like the Strahta battle theme and the Fendel battle theme but besides that...whatever.
Abyss I don't care much about either. I do like Awkward Justice though.
I have listened to a lot of music from past Tales games though I haven't played them. I know I missed out. Destiny, Phantasia, and Symphonia have nice music. I do like a couple tracks from Rebirth (Final Episode, Scutum - Decisive, Battle Organization), Eternia (the Inferia battle theme) and Legendia (the English OP and the Title theme are AMAZING.)