A friend of mine tried to explain it as if someone sat you down and had you watch a really weak episode of season 4 of a series they really liked. All the backstory, the callbacks, inside jokes, etc are completely lost on you, and it gets increasingly awkward as it's clear you don't like it.
Something that sort of threw me for a loop: he had no idea who Yoda was. I was like how can you not know who Yoda is! He's a part of pop culture! He was sort of generally aware he existed but he is relatively young and foreign born, so him appearing as a ghost out of literally nowhere, talking like a Muppet with broken English and throwing lightning bolts seemed deeply stupid to him. And I couldn't really defend it. It is sort of stupid.
Without the nostalgia element it's just a new scifi franchise that had a lot of initial hype that it didn't live up to. A lot of foreign audiences are as excited to see Solo as Americans are to see a prequel about the Tars Tarkas from John Carter of Mars.