No you are correct, I meant Undercover. And it was for my PS3, so I expected it to be as smooth as silk. I completed NFS Most Wanted and Burnout Revenge when I had my 360. I was looking forward to an arcade style driving game. But every now and then, it would freeze for a fraction of a second, maybe dropping a couple of frames!
I was gonna say it would probably have played better on my PM with my 8800GT, but for it to have been choppy on the PS3 suggests that the game has just been badly written.
I took it back earlier and got a refund no questions asked. Which is actually a little unusual - normally you can't return the games unless the actual media is faulty in which case they just replace with another copy of the same game. So maybe I am not the first to return it.