Metal gear solid 4.
I ended up playing it twice through, once on Big Boss Hard and once on Big Boss Extreme.
Unfortunately it wasn't great for learning much Japanese since I spent a lot of time lying in the grass in silence
But I also have ordered FFXIII, and very much look forward to playing it.
When it comes to import games that you want to play not only for fun, but language learning too, RPG's are great.
The last import RPG's I played were 龍が如く 見参 and 白騎士物語, both were very fun for me
