Redefining "the very nature of what it means to be human", as per your introductory comments.
First, I must say that humans or sentient robots will never be God. God is infinite perfection. The most we can do is advance ourselves to previously unimaginable heights. We can never be infinitely perfect.
Is it wrong to want to rid the world of disease and hunger?
Is it wrong to want to put an end to human suffering?
Is it wrong to want to live forever (or as long as we want to?
Maybe this universe is not all there is. Maybe this universe is just a pimple in an infinite-dimensional superspace. Living here for eternity might be compared to setting up eternal room service in a train station restroom.
Which is why they shouldn't try to play the part.
Is it wrong to want to rid the world of disease and hunger? Is it wrong to want to put an end to human suffering? Is it wrong to want to live forever (or as long as we want to?
There's nothing wrong with wanting any of these things. Playing God in order to achieve them, on the other hand, is another matter.
Nothing is perfect. Everything has flaws. Depends how you look at things of course. However you look at it, the universe seems to be bigger in content than anyone is capable of fully knowing. This is a good thing since that means no matter how long we live we might expect to stumble across something unexpected and not unpleasant. It does not change character nor poetic insight. Living longer and seeing more is simply a difference of quantity, which in itself isn't particularly interesting.