Well..
Glitchy, very glitchy.
The primary glitch, which was most annoying in a game like this, was that you would often randomly ride through or fall into your ramps (which makes it unplayable). And before you say "well you aren't drawing your ramps right" or "there may have been a space in your ramp that is why you fell through", I should say that is not the case. In fact all of my ramps were a single line, and I always started from the lower left corner of the drawable area (as one would be prone to do in a game like this) and some of them worked, others I would ride through as though they didn't exist, or fall into half-way up the ramp. I did not notice the same issue with the landing ramp , but at the same time, because of the issue with the starting ramps I didn't get much use out of the landing ramps.
Another big glitch is that occasionaly after clicking 'go' to start a run the bike wouldn't do anything. Well, I shouldn't say anything, he would set there and make reving noises. But much like a two year old setting on his trike going "vroom vroom" there was no movement involved. (strike that, chances are the two year old would be moving).
The graphics are OK, the music was nothing to write home about, and the glitches sucked. 2 for effort, and I thought about not giving that, because as others have said, the prior two in the series were better.