I hate to admit it, but I'm very on-and-off with Persona 4, which I picked up recently. Every once in a while I pop it in and play for a couple hours. It's timing, really. I was hooked on FFX when I first got it, so that took up most of my time. I'm presently clearing out a backlog so I can really get into it.

I played Pokemon SoulSilver for 10 minutes. I picked my starter (Totodile), caught a Rattata or something, and that was it. Haven't touched it since! Likewise with Pokemon White, but that lasted a bit longer before I lost interest (Castelia City, I put the game down because it was too grindy). I love White 2, though. Reinvigorated my love for the franchise.

Also, Kingdom Hearts II when I first got it. I spent about four hours fooling around with Roxas, then didn't play the game again for three years. I'm currently fixing that (17 or so hours so far, I think I'm about halfway through...).