you know they could have kept the "spirit" of the book and it would still be dark. Daredevil since the 80's has been one of the darker comic books on the market. So this whole thing of it being dark doesn't carry a lot of weight with me at all.
Based on the source material a much better adaptaion/screenplay could have been written.
And lets forget the source material for a minute. This movie just had some bad writing. Elektra, Kingpin, Ben Ulrich, matt Murdock, and Foggy Nelson were flimsy.