I'm not usually much of a racer, though when playing GTAV online, I probably race more than any of the other gaming options.
I loved the older GTA games that were top down and racing around in those games was an absolute hoot...
As an all time favorite I'd probably have to go with Destruction Derby, simply because it was the first game with really good vehicle destruction physics - blew my mind.
Of the Dirt series, I probably played the first Dirt the most - Colin McRae: Dirt (2007) and I've been debating with my friend whether we should get Dirt 3 or 4, but after taking a good look at the content and all the extra multiplayer features of Dirt 4, we both want to get Dirt 4.
I just can't afford it yet, so am obviously crossing my fingers to get it here 😉