I used to use Nuendo 3 before moving to a Mac where I'm now using Pro Tools. Although its been some time, I recall having a drum editor in Nuendo. Its much like a piano roll but optimized for drums which is probably the closest to a drum machine in Nuendo natively. If you're looking for a drum machine as a sampler then I believe you're out of luck.
Cubase is optimized for Music while Nuendo is optimized for post production, although I believe Nuendo is built over Cubase. I feel that Nuendo is overkill for just music production but can be extremely useful for post production. There's no saying that Nuendo can't be used for music production but I just feel that too many things would get in the way.