I was the opposite of you, Patrick. I loved the world building in the first hour, but beginning with the sniper scene it started to go off the rails for me in kind of a Suicide Squad-y way where I'm assuming the reshoots made a mess of things. For me, anyway. I also thought the characters were wasted. Some great effects though.
The central conceit of the movie was wonky to me, too. I get that the trench weakness is considered a "flaw" in New Hope, but I don't get why the engineer built in a flaw that required a third party and a million to one odds to detonate instead of building in a flaw that just made the Death Star, I don't know, overheat and combust or something. It's a classic case of overthinking what should have just been considered a silly trope in a kid's movie and moved on from. The end result is just as silly, only arguably moreso because it's pretending to be smart.