Batman & Robin ruined the Tim Burton Batman series (yes I know he didn't do the second half of them) for everyone except me. Because it was terrible, no one wanted to revisit the three awesome movies that came before, and forgot it entirely when a darker, more realistic film series came along.
I didn't like Batman & Robin either, but I just ignore that film now. I implore every fan of the X-Men film series to do the same with Dark Phoenix. (Unless you enjoyed it of course) Don't let it ruin First Class, Days of Future Past, Apocalypse, and Deadpool - whichever are your favorites - for you.
Me, I received the warning already, I'll ignore it entirely, besides, it disregards the ending of Days of Future Past.