Conclusion: Does Forza 4 really need day one DLC? If the American Muscle DLC pack is anything to go by, the answer to that would have to be "probably not". Unless you have a particular interest in classic American muscle - or have purchased the Forza 4 season pass - you'd be better off waiting for this one to be discounted.
Conclusion: In a world where movie licenses generally suck, Eurocom and EA games attempt to buck the trend. The developers managed to successfully mix together several different gameplay elements into one coherent game. Sadly, these elements feel underdeveloped which hurts the overall experience.