Tales opened the door for real time combat systems for me. Previously I really, really hated them.
I'm partial to even a simple turn-based battle system though. Atelier does me just fine (Persona can be quite fun too).
Best battle system I ever played? I'm partial to FFVIII's version of ATB just because they have triggers to keep you engaged in the fighting, thought that was a very smart move (i.e. Gunblade; Summon boosting).
Grandia 2 had a smart idea of timing so you can knock back opponent's attacks, which I still see being used in various other games to this day. That really got things right too.







