Likewise we need to have small quick maps when there's just a few of us having a quick game, and a few big maps for when the server fills up and we want to play something longer with a bit more depth.
Personally I think ONS isn't really about vehicles, its about teamwork and tactics. Sometimes the vehicles are an integral part - like where you have to work together to support a few important ones - but other times having a lot of vehicles all over the map is a distraction. I don't think an ONS NV map is really played like a DM or TDM map*.
* Some players do play in DM style though - one time there was one of these players going after a critical node, so I just winged him with the minigun from a distance and took off; he chased me all over the map while the rest of my team killed the core
