Defend the movie without attacking other movies. The points will be better made that way.
To be clear, I'm not complaining about the "bright tone" of the MCU movies. They're fine, in fact it's a positive feature. The innocence of the original Captain America movie is, for example, an underrated feature of that film. I just don't need everything to inhabit the same niche and I don't feel the need to complain about a superhero movie being "dark." Three decades on from
The Dark Knight it seems something of a ludicrous complaint.
I don't have any compunction about comparing Snyder's action style to the MCU's, however. That's one area where Snyder consistently kicks ass and roundly deserves to be congratulated and learned from, not derided.
Man of Steel, with its massively destructive Kryptonian throwdown that "disappointed" certain geeks, is a case in point. That was everything many of us have been waiting to see from a superhero brawl, and the complaining about it was absolutely bizarre to me. By contrast, the MCU's best efforts are cartoonish and frankly -- for all their spectacle -- a bit tepid and devoid of any real suspense. (Case in point:
"Paper people." A violation of Drax's "literalism" trait but a frank and honest description of the hordes of disposable and unimpressive mooks that have turned up in
at least three films to this point.) Even take BvS: I felt a genuine tension when Batfleck loomed over Superman with the Kryptonite spear that was entirely absent from the super-brawls of
The Avengers or
Guardians of the Galaxy or virtually any other MCU movies, and I don't think the effect of the "dark tone" is coincidental there.