I have been playing career, and for the most part it works with some perseverance and repeated server fails.
I cannot however repair my car. It fails every time. Incredibly frustrating.
I dont know if Im missing something, but like others I dont understand why I need to connect to a server to play single player mode which should be run from the disc.
Tempted to dig out my PS2 with Colin Mcrae rally. That wont need a server to play....