Best DVD Burn Resolution - Nero



So I apologize if this is a bad message to begin with but I am just getting into this whole thing. When I pull video off my DV camera the data format looks like it is NTSC (or somthing to tha effect). When I finalize a project with Nero it convert the project to an MPEG-4 or something like that. I may be imagining things, but the resolution of the MPEG looks considerable lower than the DV format. Am I missing something? Is there a way to not burn a DVD with a MPEG format?

Thanksin advance!