Was really looking forward to a DM mode as well

Hoping they will add one later on!
I get why id did this...Everyone plays COD or BF and unless you devote most of your resources to compete with them in that Arena--why bother. Those games focus on MP and the single player campaign is much shorter.
Honestly if RAGE had traditional DM, people would play it for how long before they just went back to play the 2 games I just mentioned. At least with Vehicle combat it's something NEW and probably has a much better chance of having a loyal and lasting fanbase.
Until id makes a multiplayer focused DM (which I doubt), military shooters will dominate in that space. A FPS MMO would be kinda neat but I doubt id ever goes that direction. I think that is one frontier that has not been compelling enough...FPS MMO