Disgaea DS. I got like maybe half way through the game, only to come to the conclusion I really hated the grid-style battle system. I liked it sort of at first but it progressively made me more and more pissed off, even when I attempted to get into it.
Another game I probably won't be going back to is Fire Emblem (can't remember which one, it's on the DS). Pretty much for the same reason as above, but with the addition of an abundance of dialogue. Yes, I know I can skip it, but that results in me being clueless. I either spend 3x as much time listening to dialogue as I do playing the game, or ONLY play the game with no dialogue. Very irritating. But I hear FE games tend to do that anyway...