I was there. At the end. They just turned it off. Well, from my perspective anyways.
As of 12:00 AM Saturday September 1, 2007 (CST, +/- a minute or two), Auto Assault was no more. I went out the way I came in, blazing away at PvE targets, looking for some or other quest text specific entity. And then they stopped reacting. And then it disconnected.
I suppose, truth be told, as MMOs go, it lacked. A lot of people have been pointing out how the game really didn't lend itself to group play. You can't drive a car and type chat with your mates at the same time. Or at least you really, really shouldn't if you want to survive. VOIP should have cleared all that up. Any body with an IP address can run a ventrilio or TeamSpeak server. You can rent a real server (if you worry about bandwidth and such) for lunch money if you need to. In the end though, not lending yourself to group play seems a bad characteristic to have as a massively multi-player game.
The upside is I have reclaimed almost 9 gb of hard drive.