Over at Pocket Gamer, they recently ran a feature, looking at the review scores of western-developed titles compared to those that originated in Japan. Guess what? The Japanese games scored better. Le gasp!
But, in all honesty, Japan has been producing better games for the DS and maybe a lot of that is a genuine interest in the handheld's capabilities and not so much financially-driven like so many movie tie-in titles and the like developers in other regions are putting out for the console.
All in all, it's a very good read and worthy
of your time.