FF12, couldn't beat it because of how god awful the leveling up and battle system was.
Man...I played FF12 for about 65 hours and then my 3 year old brother completely wiped my PS2 memory card, taking out Valkyrie Profile 2 and KH2 pre-final boss saves with it, as well as the FF12 one. Ever since, I haven't been able to get myself to replay that huge part I already did. What exactly didn't you like about the battle/leveling up system though?
(By the way, I love that signature under your avatar. It makes me feel happy.)
On-Topic: Last RPG I played was probably Rogue Galaxy. Very mediocre RPG but I got through it just because I was so close to the end before I realized that it was just a "meh" game. Before that it was Valkyrie Profile 2, which sucked pretty bad compared to the first. Got to the end of it but never finished it due to the whole memory card wipe issue.