One problem I had that no one's mentioned...
Or at least I haven't heard mentioned. They made NO attempt to recreate the 90s the way X-Men First Class recreated the 60s, Days of Future Past the 70s, and Apocalypse the 80s. They even used a made-up president whereas Kennedy, Nixon, and Reagan were established as the presidents in the respective previous films. What gave away that it was the 90s other than no cell phones?
Besides that, I didn't really have a problem with the movie other than, like almost everyone else, I didn't want to see Dark Phoenix adapted again. It didn't deserve to do well, but it doesn't deserve to bomb either. I liked it better than Wolverine in Japan.