I saw the videos and listened to the devs. Until you play the game drivatars don't make a lot of sense. It's awesome seeing the AI cars not follow the perfect line every time. Cutting people off, jerking to the outside, going off the track, brake checking in front of you. So many things happen in this game that keep it original every race.
It's also funny seeing my friends in there. I know it's not them driving, but I curse their name every time they slam into me or rocket past me when I make a mistake. Awesome feature.