I played Motorstorm a fair bit, I think I pretty much completed it. I used to come back to it now and again and have a blast, but it became boring on the same rocky surface.
There's so much more to this one with the 4 different area's. You really have to choose your paths more carefully depending on your vehicle choice, and the different ways they've implemented water to cool the boost is great.
I wasn't expecting much different to Motorstorm tbh, but the whole game just seems to be a much faster pace, more exiting and with the great new features and jaw dropping graphics; I'm pretty pleased with it