My personal favorite comparison is about generation decline and how Dante's Inferno's first month outsold Max Payne 3's first month, the 5-6 years in development, 5+ studio Rockstar May game.
We were talking about this in the NPD thread, but is it really just generational decline or other forms of monetization sucking the life out of retail. Anyway, that's getting a little off topic as the Japanese market seems to be doing much better due to the 3DS.
Edit: As for Training games, is there any sign in Japan that people are still into these types of games. I don't remember Brain Training being on the charts nearly as long as Nintendo's other evergreens. Mario Kart DS was still charting like last year.