i didn't enjoy FFX-2's much at all.. mainly because one of the things i like in a turn based battle system is one that i stop and think about strategy -- not as much as an SRPG -- but enough so that i'm engaged. FFX had that, and xenosaga had that, in this gen, IMO.
i also don't like FFX-2's much because of the disappointment of getting rid of FFX's, which seems like it'll be the only game in the series that gets to use it. which is a huge pity because IMO it's far and away got the best battles in the entire series. i also was just kind of sick of ATB for having played games using it for over ten years at that point. sure, it evolved, but ... well ... i don't really like FFX-2 in general. i'll leave it at that.
star ocean 3's battle system has PROBLEMZ. lots. since we got GI today, i imagine it's OK to start talking about this soon.. =P but i'll probably wait until it comes out unless the floodgates start to open.
i love TOS' battles, on the other hand, because they're fun and you have the control you need over the AI. you can stop it and do things manually whenever you need to, but if you set things up right, you don't really need to. and you keep learning new techniques throughout the game. good stuff.
really, battle systems, action or not, just need to be well designed AND well implemented. the only grandia game i played was grandia II, but i thought although its battle system might be intelligently designed, but it's also irrelevant cos the game is easy and boring.
a good turn based battle system is really, really compelling to me. i also like ones like phantasy star IV and persona, which reward you for intelligently setting stuff up and then letting it run, as opposed to forcing you to just do the manual entering of commands every turn.
i guess in the end what i'm saying is -- i actually prefer turn-based battle systems; but only slightly. what i like is good, intricate, yet understandable battle systems. then i won't complain.