Integrity and Faithlessness was okay in my opinion, but not as good as all others. For me, it was mostly because the story kind of rushed toward the end & ended pretty suddenly. The gameplay was fun, though imo. Luckily, for me, The Divine Force was an excellent comeback & much better imo! 🙂

If you end up getting interested in the lore of the overall series, I would recommend at least playing all of them once, though. One of my favorite things about Star Ocean is the fascinating lore of the series. But that’s just me. The most important thing is that you focus on what you enjoy. 🙂