IGNORE THE BAD REVIEWS - THERE IS STILL ONE MORE MOVIE (Minor spoilers)

Rating: 7/10 (28 December 2017)

For goodness sake, I think it's silly to expect the Last Jedi to answer every one of the Force Awakens questions. Ignore people who say that this movie did not cover these topics - they certainly did.
Who are Rey's parents? It does not answer this, but it absolutely covers it. When Rey falls through the hole to the bottom of the island, a place of the Dark Side, just like Episode V, she asks "Who are my parents?" and on the other side of the transparent wall she is looking at you see two figures approach, but they merge into one and when it comes into focus she just sees herself. Later, Kylo Ren tells her that her parents were nobodies and she's always known this (though we an easily assume this to be a lie).
Who is Snoke? While it does not say definitively, we get major clues. In the first half of the movie, Snoke electrocutes Kylo Ren with his hand - Palpatine's major Force power. When Snoke tries to seduce Rey to the Dark Side, he uses almost THE EXACT SAME TACTICS as Palpatine used when he tried to seduce Luke. He shows Rey the Resistance fleet being destroyed, just as Palpatine showed Luke the Rebel fleet being destroyed. He uses "It was I who..." statements, just like Palpatine. And he uses the same line as Palpatine - "Fulfill your destiny".
There is one more movie coming out that could explain all of this - where would the fun be if it was all explained here and not in the last episode? The only original trilogy character that changed was Luke, and that was kind of the point (though we see him at the end as reverted back to awesomeness). Leia is still the same, Han is dead but he was the same in the last movie, Akbar is the same, Chewy is still the same, all the familiar faces we see from the originals are the same.
And as for the aggression against Leia surviving in space, SHE USED THE FORCE, PEOPLE. Or perhaps Kylo Ren used the Force to save her...? I can assure you that part makes much more sense than how Luke survived in Episode V (he lets go after Vader cuts off his hand and is falling straight and suddenly and inexplicably curves and lands safely in a hole so there would be time for him to be saved by the Millennium Falcon).
It's a great movie, and though it does lack some of the original Star Wars feel it is still a wonderful and stunning part of the Star Wars story.