We learn plenty about Rey over the course of the story, they just left the details of her family and her strong Force powers open for the sequels to explore. Which is pretty fair, I think if you answered every question about her in this movie she would end up pretty flat in the sequels.
I think the ending was probably unsatisfying for you because of how it’s more of an unresolved ending than the ending of A New Hope. There’s a lot more plot threads left deliberately unanswered because they have sequels planned, while ANH leaves almost everything neatly tied up but has just enough loose ends to pull through for Empire. People never really seem to enjoy cliffhanger endings very much.
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