In the case of XMen: Days Of Future Past, the plot holes were so significant and immediately noticeable (for me) that whatever redeeming qualities the movie had almost didn't matter. All I want from fictional universes to play by their own rules and remain coherent/consistent according to what they have established. Set the boundaries to crazy & imaginative extents, but play within those boundaries.
If a movie is trying really hard to have a long continuing story and decides to fill them with huge gaping plot holes, then yes, I consider it a pretty big fuck-up. People can't say "just enjoy the action" if almost half the movie has people having long talks, getting emotional, explaining stuff, switching between past/future, etc.
If a movie makes it clear that it doesn't really care about the plot then plot-holes don't matter so much.
If a movie is trying really hard to have a long continuing story and decides to fill them with huge gaping plot holes, then yes, I consider it a pretty big fuck-up. People can't say "just enjoy the action" if almost half the movie has people having long talks, getting emotional, explaining stuff, switching between past/future, etc.
If a movie makes it clear that it doesn't really care about the plot then plot-holes don't matter so much.