Hmm, yeah, I guess I'd consider Kain series and Brave Fencer as "forgotten games", but mainly because those franchises have been dormant for so long. Most people I know that grew up with PSX still have fond memories of those games. Soul Reaver was definitely a big deal when it came out.
However, I do remember Brave Fencer having a pretty rough release, even though it was highly anticipated by Square fans. Problem was, it was a middle-budget title releasing around the time that some similar, really polished games were showing up like Alundra, Megaman Legends, and Star Ocean 2. N64 was also hitting its stride then, so when Musashi finally released in the States, a lot of people were already saving up for Ocarina of Time instead. Most of my friends didn't have time to check out Musashi until much later, when it started showing up in bargain bins. Really sucks when that kinda thing happens to a game.
It also reflects on how tricky it was for kids to juggle multiple games back then. You couldn't just throw $10/$20 at a game and store it on your hard drive for later, or watch a Youtube vid of it if you weren't sure about it. If you wanted to try out a new game, you had to hope it would be at the rental store, and if it was, then you had to hope it was in enough supply so that you didn't need to convince your parents to rent it out for multiple weeks. Otherwise, you or a friend had to be able to buy the game right away, or just hope Toys R Us still had it on the shelf by Christmas time. For a lot of kids, a game like Musashi was just difficult to find, and expensive to try.
Thankfully, we weren't really gambling with our money then, because there was so much good shit out there to play! It was a little rough, but those were fun times for sure.