I'm not a big fan of racing sims. The only racing series I've ever gotten into is Mario Kart, though I've grown an affinity for driving over the past few years, and enjoyed what I've played of Prologue.
I'm not very hyped, but I will be buying the game, and I'm quite impressed by all they're cramming into it. Kinda like Halo 3. I'm not a big fan of Halo, but Forge really impressed me.