Nicky Hayden had a great season, considering the Ducati was poor, you have to bear in mind that there will be a huge amount of subjectivity on this subject, from every contributor I guess.
All the front runners in 11 are great racers, and the fact that so many are real battlers made it a great season.
Me? I think Lorenzo's a little twat, Casey Stoner is a whinging litle tosser and that all the others are (were) ace.
Tie that in with Moto2 and 125 and you've got a travelling circus that makes F1 look like Fred Carno's Army (google will help you with that parallel, Sly).
Roll on 2012 season.