Of course our system of democracy is not perfect. If we wanted to be cynical in our view of politicians and how our democracy works, we might recall the story of the labourers sitting by the side of a road in Russia breaking stones with lump hammers when horsemen gallop by. One of the labourers shouts up, "who is the new czar?", and a horseman replied, "It doesn't matter to you. You will still be breaking stones tomorrow."
Taking all the imperfections of our system into account, it is the only system we have and one that is worth maintaining.