I don't know. The thing is, some people who didn't like Man of Steel argue that dark and gritty is Batman's thing, not Superman, and that Man of Steel borrows too much from Nolan's Batman in look, style and tone.
Now having that Man of Steel style and tone in a movie with Batman in it might actually work for those people.
Now, as someone who became a fan of Batman through the Burton films and BTAS, i can say that Ben Affleck's portrayal of Batman is what i'm looking forward to the most in this film.
But beyond Batman, i also feel that Superman could have been a little less dark and gritty from what we've seen in MoS and the BvS trailers so far. Even if you go by Zack Snyder's words that "comicbook fans know my Superman is close to the comics", Batman V Superman should be Alpha versus Omega. Dark versus Light.
I may be paraphrasing here, but i believe it was in one of the Timm/Dini animated shows where they said that the difference between Gotham and Metropolis is that in Gotham people are afraid to look to the sky while in Metropolis they look to the sky for hope. AKA the key difference between Batman and Superman, and how the public sees them.
In my honest opinion, i think that Ben Affleck should have been in his own Batman movie first, and Henry Cavill deserved at least one more Man of Steel film to explore and showcase the personality of his Superman.
I also think that Batman works best in a dark and gritty setting, and i think we all know this all too well, however, when it comes to other superheroes, the thing is
HEY EVERYONE!