Have you seen moebius comics ? i think brightnes is not the problem, for me its that its still a bit bland and could use more atmosphere but i always think of that genre as super colorful and bright. Bladerunner was particularly dark because the cynematography imitated film noir a lot but it doesn't necessarily need to be like that. Bladerunner ended up being even darker than syd mead's concept art for it and was very 40s in the art direction. I personally prefer art direction with the 80s feel to it.
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But its true though, Fallout games looked like trash from the brown and grey era, i don't miss those days