AGREED.
Mine (there'll be a LOT less systems : D ) :
PS1: I need to say FFVII even though I haven't finished it yet. But I love the story this far, the music, and the world and some of the characters are interesting.
PS2: KH2. I like the story even though it was quite confusing at first, gameplay is fun and more fluent than in KH1.
PS3: FFXIII Lightning Returns. I love exploring the world and the freedom you have and the quests and stuff. The gameplay is better than in the previous titles in the XIII series in my opinion, and I like the story too even though I might prefer the stories from the two other games a bit.
DS: TWEWY. It has awesome gameplay, story, characters, visuals, music and they all fit perfectly together on an original way. It's not confusing, it can't be too hard or easy (at least not very easily) because it has so many different difficulties you can choose from and you can change it anytime. The gameplay is just so much fun and original.
3DS: KH3D It's actually the only 3DS game I've played D :
PSP: BBS. I LOVE BBS. It's my favorite KH game. I love melting commands, and the gameplay overall, there's just enough to do and just enough speed (like, KH1 is too slow for me and 3D too fast). Ven, Terra and Aqua are great characters and their story is wonderful and well thought It's such an important game in the series as well.