As has been touched upon by others, it is important to see Evolution for what it is and not what we would wish it to be.
If we are to generalize, life on Earth consists of bacteria and other single celled creatures.
They are the winners both in terms of numbers and biomass.
Evolution has no obligation to 'breed forth' some kind of superior being, unless that superiority is based on the ability to reproduce and survive until reproductive age.
That is, I'm afraid, the long and the short of it.
Thus, if we wish to apply other terms of superiority we will have to look elsewhere, which means that almost no matter what standard we decide upon as the measuring stick, it will, to one degree or another be subjective and based on a human perspective of what is 'superior' and not.
If we are looking at a specifically human 'superiority', that would almost certainly be our ability to invent and apply technology, as far as I can see the only area in which we have all other species beat.
In that respect, scientists and inventors are the most 'superior' among us, although none of their work would have been possible were it not for our innate ability to communicate and cooperate.
Humans are social animals, and as such this is the basis for the near universality of morals we see in human societies; a disdain for murder, theft and rape.
And thus, in one fell swoop, we have an adequate explanation both for our success as a species as well as ethics and morality, without the need for some absolute standard for superiority nor the supernatural.
As talked of, at length, in his book "The Extended Phenotype", Dawkins makes a pretty good case for the evolutionary basis of not only human society but also for our prowess when it comes to technology.