I attempted to get back into Tales of Xillia earlier today but no dice, it's not bad but it seems to lack that something which engages me and pushes me onwards, after walking into another field area filled with palette swap enemies (seriously, this is like a new record for this level of recycling and i'm not even halfway through) I just can't go on, I'm all Tales'd out.
I feel like adding actual dungeons and puzzles back into the series would help this. Even though Symphonia for example had some idiotic puzzles it definitely helped add variety to the experience. I'm in it for the battle system but for people who don't care quite as much about it, it would do wonders for them I think. In Xillia if you're not super invested in the battle system or narrative there's not much else to the game.