The problem isn't that they should have only released it in japan, it's that they shouldn't have released it at all when they did... The game needs more time in development, which is basically what's going on now.

If you judge it as a full complete game, it leaves a lot to be desired... But imo, if you consider it a work in progress, I think it's well on it's way to being the best mmo around. Aside from just needing more content, what they do with the class and combat systems will really determine the games future, as the content and more tweaks are inevitable, but this is probably the only time they will overhaul such fundamental mechanics as those in such a drastic way. Sure hope they make the most of it, definitely don't want them to rush it.