Fluid, fast, and fun.
Technically speaking, the game is nothing amazing. The graphics are adequate (and I mean that in the best way), but the crashes are rarely thrilling, never spectacular. It nonetheless generates a visceral, exciting feeling. shifting the Wiimote puts you in the game in an exciting way, and, for the record, the controls are flawless. If you can't steer, it's 100% you.
It should be noted, however, that your enjoyment of this game is fully contingent on filling an SD card with rock music (up to 100 songs). There are a few flaws with the music system, the 100 song limit being the first. Song selection is random unless you select a specific song to repeat ad infinitum; sometimes when a song plays on random, it will select that song and repeat it--this has something to do with the encoding of the song, I think, because it only happens to certain tracks. Aside from these glitches, everything works fine. I recommend The Strokes, Queens of the Stone Age, and songs like "Bodysnatchers" by Radiohead.