I do think Rey's storyline was too much of a cliffhanger here. I think if they did simply confirm more of her background, people wouldn't have had a problem as much. ANH was a standalone story so it told you all you needed to know like Luke's father was a Jedi and a great pilot, hence you're okay believing that Luke is suddenly able to fly a ship he's never seen before and can use the Force to hit an impossible target.
Rey's whole backstory is not confirmed at this point and a lot of the stuff in her life on Jakku isn't verbalized in the film but rather it's in these side books like the art dictionary, novelization, etc. (like how she has a flight simulator, how she's worked on the Falcon for her boss) so you are left a little hanging there.