Discussions about KH3D got me into an interesting topic about what games or franchises are so good that you would buy a gaming console for it. This isn't just relegated to one game but basically, list what titles need to appear on a console before you will drop some serious cash to purchase a new gaming console/handheld/PC upgrade that your non-gamer friends and family say you don't need.

Persona
Shin Megami Tensei
Metal Gear - Yes despite my ranting that I wish the series would finally end forever.
Assassin's Creed
Monolith Soft
Yasumi Matsuno

I'll try to think of some more.