Millar's Ultimate FF was far darker than the original version by Stan though. Compare Doom from that series to the Doom from the FF movies. By dark, I don't mean the characters themselves have to be grittier, but rather just the story. Keep in mind that I'm not comparing this to DKR, I'm comparing it to the Swiss Family Robinsons of comics that they were originally used as.
...which is sort of mid-range action, adventure dark. It isn't a Spielberg movie, but it isn't Saw either. It feels like a British sci-fi book, like his later FF run which seemed like he merged Gerry Anderson and the FF.
I get that it is dark, but it isn't as dark as Millar can go. It isn't Chosen or Unfunnies dark. It isn't even "Wanted" dark.