Maybe because I've been forced to watch the original sooooooooo many times over the past 6 years I'm a little burned out on it. .... more the a little..... but I really liked this one more. Perhaps it's just a fresh look the characters.
I'm not a NASCAR fan by any means and I thought the racing action was better and how it touched on the way the sport evolved by starting in McQueen's era and seeing it give way to the next generation of high-tech racers. But then visiting the roots of the sport as moonshine runners. And of course the demolition derby.
Of course a lot of the story and jokes have no context without the first one so in that sense it doesn't stand alone very well.
Most importantly... very little Mater.