Is it clear that they do have more problems? The U.S. Government blew up a majority of its initial rockets. U.S. private sector companies almost always have a failed first launch. SpaceX's Falcon 1 failed in 3 of its first 5 launches. Japan having a failed first flight is 100% what one would expect—it would be exceptional had it not failed.
I'm talking about space missions in general, not just rockets in particular. But as I said, maybe it's just my perception.