A little has to be atributed to the camera of course (put in on roof cam in replay for better comparioson). When driven in 1st person, the car bounces like any other in AC, but of course not as in real life. Which is ok IMO. AC physics can't handle actual shake. Cars that try to replicate this (crsh cars for example) loose grip more that they should which makes them undrivable.
Oh yes Focus is a beast up Pikes Peak for example. But maybe a better example of car with unrealistic grip level than the Viper.