I don't necessarily disagree, but it's missing the forest for the trees IMO. These kinds of looks aren't terrible in and of themselves IMO, it's just that they've become representative of Snyder's generally sociopathic approach. It's okay to have a dark tone, if the movie works as a movie and the audience feels engaged, with well delineated characters, who have congruent behaviors and goals, whîle the story flows forward. Except Snyder's movies have really underdelivered for me in these aspects and I felt like I was left with a very mechanical end product. The look and tone are symptomatic of this but aren't the root cause.
There might also be (in my case) a bit of fatigue seeing this kind of treatment applied to DC. After the Nolan movies, the Arkham games, and the Injustice franchise, I could use another approach to this universe. I assume they really wanted to have that tone for their cinematic universe because it gave them some cross media congruence, but it's a bit too much IMO.