Bonus points to the Ar Tonelico 2 bug that would go off in the enemy phase of Round 3 of the Raki fight. Not only would it crash the game WITHOUT FAIL, but the bug was not present in the original Japanese release of the game. Yes, it's a bug that only manifested once NISA got their hands on the game. Oh, it gets worse: the only fix for the problem was to win the fight before then, and the only way to do it besides hacking or playing another region's version was to use a battle system exploit that would allow you to attack almost indefinitely by attacking with both characters and then immediately juggling a reyvateil song back and forth between both backline characters to reset the internal turn counter. It was a game-breaking exploit that made the battle system trivial, and they just told people how to do it on the forums, forums on which so many people were angry about buying an essentially defective game, that NISA staff on the forums (or community managers, who the hell cares) got super toxic in response. If it were possible to recall a video game, that would've been a prime candidate for a recall. They likely missed such an obvious bug in QA because they were running max level characters who could tear through the boss like it was paper in order to make test playthroughs quicker.
In short:
1. NISA releases relatively unfinished localization
2. Localization contains 100% chance of gamebreaking bug not present in JP release
3. Bug is so bad that NISA tells everyone on the forums about a gamebreaking exploit that can be used to get around the gamebreaking bug (and everything else)
4. They refuse to take any kind of responsibility for the clown fiesta that is their release
It's why I haven't bought a NISA game to this day.