Stuff doesn't get fixed between the American and Japanese releases of a game. It never does. Don't expect it too, and don't expect reviews to completely turn around their opinions of this game.
Again, I'm not saying it's a bad game, but if you expect this to have review averages in the 9s you are setting yourself up for disappointment. That doesn't mean it won't be a great game, but it clearly has issues past just the technical complaints. I've enjoyed a lot of games that didn't get glowing reviews myself (especially on the DS). So don't worry about reviewer reactions too much.