As I have mentioned before, BMW were new to racing at this level, whereas Aprillia had a garage full of people with a wealth of experience in MotoGP; hence they won the title in their second season!
Also, Aprillia designed the chassis first, then designed an engine to fit !!!
Having said that, BMW have learned a lot, and I expect a step up in 2012- maybe not a championship, but certainly race wins.
Unfortunately, MV are not in a position to make that kind of commitment yet- maybe if the next couple years see the hoped-for growth in production, that may change.
The older I get, the faster I was!