The way I see Split/Second, how long are the massive explosions and stuff going to be fun? Obviously at first it looks really cool in a sort of don't-think-about-it-too-much Michael Bay sort of way, but after you've seen all of the levels in both normal and post-blast states, it's going to be like any other racer. You'll be ready for the triggered events because there's limited places they can happen.
I was in the Blur beta and enjoyed it. Like Mario Kart with real vehicles and no stupid blue shells.