Nothing against the World Champ Rossi, but Rossi himself said, WSBK had better racing, and he was the one who wanted to challenge Bayliss in a World Superbike event. Rossi and Stoner are great racers, but you have much more talent on a WSBK grid (more people able to finish in top five). Like Liutas said, the poduim doesnt vary much GP to GP.
there's a reason motogp riders make more than twice as much as world superbike riders.
there's a reason rossi races an m1 instead of an r1.
there's a reason why duhamel said racing world superbike over ama superbike was like choosing a dollar bill over four quarters. but he went and raced a privateer man's machine (500gp) in europe.
there's a reason bayliss kicks world superbike ass and had one win in motogp.
there's a reason that there's two former world superbike champions (that i can think of) in motogp, and neither one of them have won a motogp race.
that said, when i watch a motogp race i'm either sleeping by lap three, or looking for repeats of married with children. the 800's are like watching paint dry. it was MUCH more exciting watching guys race sportster 883's.
world supersport and 250gp's are the best racing, imo.