I don't know that I would say Nascar is "deep" based on my interpretation of the word, but there is plenty to keep you busy. Nascar kind of takes the speed and general feel of a shallow game like Getaway and combines that with a ruleset more like TFTC (ton of modes, very balanced scoring).

Theme and poorly set up route games set Nascar up to be vastly under appreciated. It's one of the bigger surprises I've had...for Sterns I've owned ACDC pro, LOTR, Nascar, TF pro, SM, BBH, X-Men pro, BTDK and Shrek and I'd rank them in that order.