I think BMW, Ferrari, and even Ducati might have something to say about that... where's the Honda in F1 for example?
OK, with that being said, I think that Honda is one of the best, if not the best engineering company in the world, becuase no one can match them for the breadth of their excellence... they have (or have had) great motors in GP bikes, cars, superbikes, and even CART, if I remember correctly....
but currently, I think BMW makes the best car motors, and Ducati is (in my opnion) even with them in bike motors....
just my $0.02