It's not about better or worse.
According to the Darwinian theory of evolution, for millions of years animals have been viciously and ruthlessly culled if they display any type of weakness. They have been bred to be feeding and breeding machines. Anything that does not contribute to these two goals is a waste of energy that may result in the animal in question failing to pass on its genes.
Yet here we have an example of an 8½ year old chimp that voluntarily starved to death because of excessive grief over the death of his mother.
That the chimp has evolved these types of emotions that have nothing to do with the stated goals of species as outlined by evolutionists, namely feeding and breeding, is a puzzle that flies in the face of the theory. If the neo-Darwin theory were true, the animal should have been solely focused on eating, defending itself from harm, and breeding. Mourning of any kind doesn't further these goals. Excessive morning that results in the death of the animal before it can breed really, really, really doesn't support these goals.
According to the Modern Evolutionary Synthesis (neo-Darwinism) at some point in the past, chimpanzees did not exist en si, but rather some predecessor existed (pigs, insects, sloths... what do I know), a species that did not have emotional reactions such as grief. Along the way, theoretically, chimpanzees and/or predecessor species evolved complex "higher" emotions. These emotions have resulted in the death of at least one chimp before it could breed.
So, if this doesn't disprove neo-Darwinism, I don't know what would.
Okay, Now i think I understand what your argument is.
Darwinism doesn't deal with social skills..
The evolution theory describes the process that caused species to become as they are.
It is indeed part of the evolution that our brains evolved the way they did.
It has no claim about feelings and emotions rather the claim that all beings that we know today are an evolved "version" of millions of years of minor changes in the biological and genetic structure.
The fact we evolved from "Primitive" beings doesn't contradict the complexity of our brain and for that matter any other being the exists.
What you perceive as Emotions, Feelings, Thought etc are all based (Whether you like it or not) on electrical charges (It is of course a lot more complex than that) that make your brain act as it does.
The fact that other species share some of our abilities (biological or mental) only proves that we are indeed all related and that humans are not such of an exception as argued by theists.
And for that matter, Most of the animals in nature are superior to humans in one aspect or another..
For example, Bats have ultrasonic hearing.
Birds can see magnetic flows of earth.
Hawk can see a mouse for dozens of meters.
and the list goes on and on..
And yes.. All species are evolved based on the natural selection.. And it has nothing to do with physical strength or weakness..
It has got everything to do with fitting the environment you live in.
So for example, green beetles will probably survive better in a green environment as they have better cloaking...
So your claim might seem weird that a chimp has emotions even though it is only "Instincts and biological processes".. but that how it works... you are the same.
The fact that we can today affect and manipulate those treats (You can make someone sad by stimulating parts of his brain for example) only prove the direct connection between the chemicals and electrical charges in our brain to our feelings and emotions...
As science is yet to know better, we know what we learned so far. Every day we learn a bit better how we work and what causes a human to act as he does...