Forget any preconceived thoughts and experiences that you may have with previous Cars games.This is the best Cars game ever and proof that games based on movies don't suck. Cars 2 the film is all about Lightning McQueen as he ventures around the globe competing in the various world Grand Prix.
Simultaneously, agents from Command Headquarters for Recon Operations & Motorised Espionage (C.H.R.O.M.E) are trying to get to the bottom of an evil plot. However the actual video game is not focused around re-telling this story and having you play out that story.
Instead, it takes the concept of racing and the Cars characters and creates a driving game that's an absolute blast to play and covered in polish. So technically there is no real story in Cars 2, its all about racing.