Well I mean it is a Superman sequel and although Batman is dark, Superman isn't dark and in both cases they have limits. Also you have to realize that for a lot of people it's not that it's too dark, it's the execution of the tone. As in they had no idea what to do with it. Whereas TDK was dark and was loved by critics because they actually executed the tone.
Anyways I read on Business Insider that a box insider brought down his OW from $180M to $163M.