I can't agree with any of that. You can't just reduce a film like that and discard its presentation and style. Infinity War still presented its Icons as things to aspire to, had jokes, fun, and daylight. If Infinity War has a glaring problem beyond its scope, it's that it did a poor job of making the case for Thanos.
The Dark Knight films showed optimism through the contrast of the will to improve or protect and the will to destroy or corrupt. They were dark movies, but they were also actually about something and gave you a central character with qualities, goals, and aspirations worth fighting for. BvS gives you nothing and the development it DOES give to Batman 'out of left field in the bookend' is completely unearned and forced. What good is the contrast of light versus dark when your Superman is a brooding misanthrope to rival the idiotic Frank Miller Batman himself?
BvS is an incoherent mess of a film that is only interested in mucking about in its own fetishism of misery and cynicism. I mean sure it adds a dollop of 'redemption' to the top of a shit Sundae in the final 5% but I still wouldn't order that off the menus thanks.
The Dark Knight movies wove characters internal conflicts, contrasts and evolution into the script from scene one and took you on actual character studies, not a series of drunken ramblings from freshman philosophers trying to beat you into submissions so that you might buy into the fallacious masquerading of a movie having much of anything to say as dragged itself from point a to point b for enternity before the credits mercifully rolled.