There's little replay value, the single races are very limited only sprint and circuit, would it have been so hard to have put check point game and some of the police chance games in single mode as well? The police chances are crap, getting alway from the police is easy, even easier when you get a fast car. When you are the police all you have to do is drive infront of the robber and they just keep driving into you, they have next to no AI at all. In the campaign you have a few check point races at the start, but then you don't get anymore till right at the very end.
Pro Street was much better than this, Undercover has about half the content that Pro Street had and the new things that Undercover has are so easy they aren't worth doing, it feels like an unfinished game. The only thing bad in Pro Street was the rythem game, other than that it was all good.
I still enjoyed it, but put it this way, I stopped playing it after I completed it and it wasn't hard to complete, I keeped playing Pro Street for months long after I completed it, I enjoyed trying to improve the way I was driving turning corners perfectly etc.