Unless that DLC pack has new track, forget it. I'm over it.
I also hate the business model. Sell an incomplete game and then flood it with DLC packs so when you go to race online some folks have the latest DLC and others don't. Seems more like Android's OS fragmentation to me. Some people have the latest version, others don't. By the time I'm done buying all the DLC crap I'll have spent $500 on a $60 game and that's unacceptable to me especially when NONE of the DLC's include a new track which the entire Forza community has been asking for!
Turn10's current target market: the Halo crowd. Their next release won't be for the enthusiast.
The future of online SIM racing (besides iRacing) will be from these guys:
http://www.wmdportal.com/projects/cars/ And unlike Turn10, they will actually build in support for a decent damn steering wheel that doesn't set you back $600.
:End rant: