The other problem is failing QA because of serious bugs, and when I say bugs, I mean giant cockroach sized uber-bugs. I have seen a lot of PSone QA reports with some weird and wonderful errors menu screens with upside down text, explosions that kill your character at random after watching a cut scene, games that continue to slow down the longer you play them, or music that sounds like its coming from the bottom of a well
the list goes on.
If a bug makes the game completely unplayable or otherwise ruins your experience then thats a fail and the game cannot be published.
If a game fails QA, there are some things that can be done to fix them but, unlike with a PSN title, they cant simply go back to the developer for another round of fixes, so it can get complicated.