Dark Phoenix is nowhere near as bad as people want others to believe. It's easily my second favorite of the new saga of films, behind Days of Future Past.
Is it as good as the worst MCU film? Nah. Is it worse than stuff like Last Stand or X-Men Origins: Wolverine? Absolutely not. Sophie Turner was awesome in this - in fact, give me any of this cast (besides J-Law) over the "original" 00s X-Men. While I'm sad that we won't get to spend more time with Turner's Jean Grey, and Magneto/Professor X will be recast eventually, I'm more than ready to let Marvel Studios take over and do this franchise justice. Nothing they've released in the First Class group of films have been bad, but the MCU's track record speaks for itself.
What we got is infinitely better than what Kinberg wanted to do originally, which was make X-Men: Civil War, with the next movie being where everyone comes back together to fight a big threat or whatever. Whoever put the kibosh on that idea/ending is very smart, because it would have made it seem like they're just trying to retread stuff that already worked for the MCU. Having the team split up, fight, and be a fractured team at the end? A big battle in New York involving Skrulls? I'm perfectly okay with the movie we ended up getting.