I personally don't miss the blood. It had just as much as an effect on gameplay as the purple mist (outside of framerate issues, perhaps).
I do wish they'd add it back in Sigma 2 Plus or the Ninja Gaiden SigmaHD Collection so people would stop complaining.1080p Next-Gen
Oh come on, chopping ninjas to little bloody bits, was fun as hell.
It may make me sound like a bloodthirsty psycho, but its true and you know it!
Purple mist don't cut it!