Yeah, I usually hate when people retort to the very stupid "if you like/dislike this you're not a real fan!!!!" argument, but... if your ideal portrayal of Superman, Flash or even Wonder Woman is one that could be best described as "dark and brutal", chances are you might be investing your time into the wrong characters.
There's plenty of other material out there that will give you what you want, there's no reason to want to see usually positively portrayed characters twisted into something they are not. Snyder learned this the hard way.
Fanboys in a nutshell.