Precisely. That is the main reason why I too, consider ep7 to be a better movie, despite being so much of a rehashing of ep4. Anyways, to try and answer some of your questions...
Here is how ep7 started, taken straight from the opening crawl:
With the support of the
REPUBLIC, General Leia Organa
leads a brave RESISTANCE.
And here is the beginning of the opening crawl of ep8, which seemingly takes place just days after ep7:
The FIRST ORDER reigns.
Having decimated the peaceful
Republic, Supreme Leader Snoke
now deploys the merciless
legions to seize military
control of the galaxy.
Only General Leia Organa's
band of RESISTANCE fighters
stand against the rising
tyranny
So sure, we saw that in ep7 the First Order blew up a few planets... but was that really the ENTIRE Republic, something which spans an entire galaxy? Remember in ep8 when they hunkered down in the salt base that they tried radioing their allies for help. So which is it? Do they have allies left (albeit they don't send help regardless), or are they truly on their own against the First Order? Definitely a bit of a plot hole here. Da fuck happened in just a couple days between movies? Who knows... Are we supposed to assume that all the fighters the Resistance had blew up in the opening battle and the few remaining ones were later decimated when Kylo and co. bombed their hangar? Seems awfully bad if that is the case and they put all their remaining eggs in one basket.
On the topic of Rey's parents, I get that they're trying to sell the message that "you don't need to be born special, anyone can be a hero," but come on, if that's the case at least have someone deliver the line with some authority. Don't have Kylo forcibly blurt it out when he's already noticeably grasping at straws, trying to convince Rey to join him (and willing to say anything to sway her). Had Rey discovered it herself in that weird (and utterly useless) cave scene, or had Luke told her at some point, it'd be set in stone that yes, she is a nobody. But as it stands, I wouldn't be TOO surprised if JJ just ignores that and in ep9 we learn shes Obiwan's granddaughter or some shit. Obviously it would spit in the face of whoever tried to make ep8 about this "anyone can be a hero" theme, but it isn't entirely impossible, I suppose. Granted, I think we're definitely supposed to just assume her parents are nobodies, and leave it at that.
Once again, no one knows about Snoke, definitely some hella sloppy writing if they don't even answer some of the questions surrounding him in the next movie. Maybe we can get a sith-esque version of the force ghost ability where he basically haunts Kylo throughout ep9... could be cool, and will hopefully allow for some meaningful dialogue about his past.
And lastly, I'm guessing that they were trying to illustrate that even the "legendary hero" Luke could make mistakes. Granted, "accidentally wanting to kill your nephew" is one hell of a "mistake," my guess is they were trying to show that while Rey is imperfect, so is Luke. That, and after all he is the son of Vader, so perhaps he's got some suppressed hatred/anger/dark side stuff in him. Still, kinda weird to have the paragon of virtue have a momentary lapse of judgement leading to him almost killing Kylo.
Also something neither of you have discussed quite yet... what do you think about that admiral (holdo, was it?) saying "godspeed" to Leia and co.? For me, it took me right out of the movie as soon as she said it, rofl. Definitely kinda weird to have any mention of god/gods in Star Wars, even if it wasn't necessarily meant in any religious sense. These people believe in an all powerful force, or seemingly don't believe in anything supernatural at all... shouldn't they call it Forcespeed or something?