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After playing and highly appreciating the second part, I considered trying the first one again, but after reading everything you wrote, I remembered how it felt, and I no longer feel like trying it.
You can try it. Its worst part is the second half of the first act, but it's not as bad as the worst moments of the first part; otherwise, the world is reasonably decent, and I don't remember any particularly frustrating moments a year after playing it. But it's important to understand that in my style of playing, I've learned to filter out undesirable elements, such as perfectionism, going around in circles, reading notes, endless dialogues, and excessive looting and inventory management, over the years, so I might not have noticed anything particularly bad. Also, the fact that I hadn't played Western RPGs for several years and had taken a break from them by the time I encountered this one might have helped.