I don't know how I feel about this question, mainly because there isn't a way to judge the collective kindness of humanity. Sure, there are stats to reflect charity donations, for example, but that's only one tiny little scratch on the coin. There's so much to consider that can only be decided upon by our hearts, so much that has happened that ultimately relies on our own experience. All we can rely upon is our emotional interpretation of what we know of the world, which in this case, is heavily biased by the experiences we have gone through in our lives. Nevertheless, I will try.
There isn't a definitive answer for this - there are so many people that can be classified as 'good', so many that be classified as 'bad', and a large majority in the middle. I think most of us try to be good people, kind people. Or we try to try. We're told to be moral, virtuous people - generally abiding upon the same principles across cultures. The specifics differ upon religious views; experiences one has had in life; cultural influence; familial/peer influence and so forth. But most of us try to live up to the moral code that we have come to understand over our lifetime. In short, we live up to our own definition of ethics.
I suppose I could be That Person and bring up the ideological influence on our morality. That is so say, capitalism, socialism and communism. As we all know, the system of capitalism asks us to disregard others for the pursuit of individual satisfaction, to use whatever means you have to get whatever you need. It's not a system that encourages kindness. It'd be redundant to go on about the Evil of Capitalism, as we are (or should be) well aware of how unrestrained capitalism has affected the world. I bring it up as an example of an outright selfish influence on our morality that we cannot avoid. It's an omnipresent aspect of the Western world, where capitalism flourishes and most of us live in. It's something we can't escape and it has shaped our respective society at every level. That being said, we can fight against the influence and reclaim the bit of morality that was unconsciously stolen from us at birth. The same goes for any ideology we are born into. They're influences but not absolutes.
At times I can be heavily cynical about the future of humankind: I don't think we'll be here in 500 years, for starters. We're in a world where some people would rather kill a person for their gender identity than try to understand them. CEOs give the clear to pollute the planet in order to chase profit. If you look through the charcoal-tinted glasses, then you'll see the awful world you expect. Humankind is filled with scum. If you look through the rose-tinted glasses, you'll see that there's also just as many (and more) who are inherently charitable, loving people. Almost perfect in their grace. But if you look through the non-tinted glasses, you'll see the majority of humanity: flawed, but trying to live their life to the best they can, whatever way they believe is best. They want more for humankind, they want to eliminate the evils that plague us. Or, they want to want more. They're human.
To answer the question, I put humanity at a 7.