You have to match the mic with the voice. But I've seldom heard anyone with any recording experience say the 3000B was much good for anything--and in my limited experience with it the 3000B is anything but dark.
I used to have a C3000B. People say its a harsh mic, but it sure complimented my Martin. I also like it as room mic for doing electric guitar. I used it on a Taylor and it really cut through the mix. It has its place.