Played a few hours last night. I ended up starting a season from scratch....looks like you have to "work your way up".
Riding the KTM 125cc 2-stroker at this point......
Just for shits and giggles, I did a stint on the Desmosedici GP3, M1, RC211, and GSV-R. The GP3 seemed to be the most difficult to handle, as the power hits like someone put a banana in my pants, and let a monkey loose.
UPDATE:
Just finished 3 points ahead after season one on the KTM in 125cc, and got offered GP rides from all the "B" class teams. D'Antin, Kaw, Suzuki, etc. I chose the sweet sound of the Ninja Zxrr.
Pretty much the same as other GP games for PS2, you get points to "buy" riders, and bikes. You can buy anyone, and race with them, which is pretty cool. I even bought the BMW 6 series safety car....it blows in the corners.
The girlfriend even likes to play. I gave her the "Handicap" of 3, turned off her Similation, and myself 1, with the similation on, and it actually becomes a close race.