Do they have the best car?
It's not reliable.
Reliability is definitely important. However, when the car itself is considerably faster than the opposition, such that without "incidents", rain or poor strategies, they are almost guaranteed a 1-2, every race...for me, this is dominance.
Had every race taken place in the dry and all cars used the same strategies with identical strategies, RBR would've won every race AND pole.
The only reason why they failed to get pole in Canada is because they chose to qualify on hard tyres.
Their race losses have happened because rival teams either used different strategies, it rained or there was an "incident".
McLaren are showing that driver skill is VERY important and that even if you don't have the best car, you can still make up the difference by having higher quality drivers.
It's not hugely good in a straight-line. The McLaren is far, far quicker.
RBR, can still complete a single lap, in a faster time.
And it seems as if they can't even rely on that speed any more, since the McLarens are catching right up.
Indeed, the McLarens are catching up, by RBR are still holding an advantage. Had RBR not crashed into eachother in Turkey and used the identical strategy used by McLaren in Canada, my belief is that RBR wouldve scored 1-2s in both those races.