Is Fast rap good or bad...?

Dissect the songs. It is about delivery. Bone Thugs rapped fast, but when you listen to a great portion of their songs they have a flow of fast, faster, fastest. They know how to use this method, which creates the Bone sound. Same thing goes with Do or Die, they rap fast, but if you listen to them it is the same setup, they know how to flow which creates their own sound. It would be the same for the slower rappers. Snoop's material usually isn't that fast, but he can flow.