Online trading is a neat idea that brings back memories of swapping doubles of the real toys but aside from that, V4 is a desperately shallow, repetitive game. Very much a sleeping dog, and you know how that little phrase goes.
Extras like a free, waypoint-based track editor add charm. The same thing goes for online car-swapping features. But between a Super Nintendo-era audio-library, limp-wristed vehicular duels, and snooze-inducing stages, it's too little, too late.