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Probably due to being too dark and adult. This has also been going on in the comics as you can see, but their success there has been better.
They have traded in his Batarang for a Batawang.
Marvel's heroes were human, with everyday human issues. DC's were as one dimensional as personalities as Disney World's plants and animal are plastic. The exception was the recent Batman trilogy starring Christian Bale, which virtually psychoanalyzed Bruce Wayne.