Two things to keep in mind:
* Don't compare JAXA (or anyone else) to NASA at this point. We (the US) have a ton of experience, some of it bought the hard way.
* This isn't Japan's typical performance. They have a nice string of very good space science missions. And don't forget things like the Mars Climate Orbiter[1], where ground based commands sent it through the atmosphere due to a unit mix up.
