Not very good...
I think the premise is OK and enjoyed the NFL Street games quite a bit. However, this game (at least the demo) seems hollow and souless. I usually wouldn't write a review on a demo, but currently, there are only 2 player reviews and they contradict each other. I also thought it was important to get the word out as quickly as possible, before people blow that Best Buy/Gamespot Gift Certificate that is burning a hole in their pocket. :)
My recommendation is that if you think you might be interested in this game, don't impulse buy it and download the demo first (available on Marketplace for the 360). I think you'll find that there isn't much to like here and move along... :p