3D Flash has come a long long way in a very short amount of time. Check this Nascar game out from Mr. Doob: Monster Burnout
From a Flash developer's perspective I think the site is incredible. It is by far the most polished looking 3D Flash game yet. And with all of the different visuals going on I was surprised I did not experience any slow downs or lag. On top of that, the ability to save replays to view later or send to friends is very impressive.
From a gamer's perspective, on the other hand, I think its boring. If I am missing something, please let me know. I jumped into Jimmie Johnson's 48, turned the rev up to 11 (1 more than 10), and hit burn rubber. But once in the car I just spun around for a bit and rammed into some walls while Jimmie is shouting "I could do this all day!" Well Jimmie, I can not. I was hoping for a race, but I would have settled for some sort of point system... anything to make me want to come back.