I think you're equivocating between "good world" and "good world for humans." Humans have made a pretty good world for themselves, but we've also caused mass extinction of many species, have used practices like factory farming of animals which creates enormous amounts of suffering, and we have yet to undo much of the environmental damage we've caused.
We have no inherent incentive to maximize happiness for all living beings in existence - evolution did not select brains that held these values as strongly as, say, your desire to seek pleasure or your self preservational instinct, which are far stronger (assuming we have any inherent altruistic desires at all). Keep in mind that evolution only selected traits which were beneficial in propagating the genes that contained those traits. There is no reason to expect such genes to carry traits that help different genes survive. There might be genes that carry altruistic behavior traits, but this does not change the fact that these genes were selected completely selfishly, for the preservation of itself.
It's true that evolution hasn't produced "paperclip" maximizers, but it has produced many replicators, with traits helpful for replicating. Is the concept really so different? Are not most organisms simply "self" maximizers?
This is the right answer, but I'd like to add emphasis on the self-referential nature of the evaluation of humans in the OP. That is, it uses human values to assess humanity, and comes up with a positive verdict. Not terribly surprising, nor terribly useful in predicting the value, in human terms, of an AI. What the analogy predicts is that evaluated by AI values, AI will probably be a wonderful thing. I don't find that very reassuring.
As far as AI designers go, evolution has to be one of the worst. It randomly changes the genetic code, and then selects on the criterion of ingroup reproductive fitness - in other words, how well a being can reproduce and stay alive - it says nothing about the goals of that being while it's alive.
To survive, and increase one's power are instrumentally convergent goals of any intelligent agent, which means that evolution does not select for any specific type of mind, ethics, or final values.
And yet, it created humans and not paperclip maximizers. True, humans rebelled against and overpowered evolution, but in the end we ended up creating amazing things and not a universe tiled with paperclips(or DNA, for that matter).
Considering how neural network training and genetic algorithms are considered some of the most dangerous ways of creating an AI,
the fact that natural evolution managed to create us with all our goals of curiosity and empathy and love and science,
would be a very unlikely coincidence given that we assume that most AIs we could create are worthless in terms of their goals and what they will do with the universe. Did it happen by chance? The p-value is pretty small on this one.
Careless evolution managed to create humans on her first attempt at intelligence, but humans, given foresight and intelligence, have an extreme challenge making sure an AI is friendly? How can we explain this contradiction?