Okay, this is gonna sound like someone attempting to be really deep and intellectual and hoity-toity sounding, but this is legitimately what I think.
Life is only as good or bad as you want it to be. It all depends what you focus on--you can focus on the atrocities in the world (Hitler, Anders Breivik, etc) and how unfair and oppressive life in general seems to be. Or, you can focus on the equally good things and people. Gandhi, Martin Luther King Jr., the numerous charities that are at the very least really trying to help people, and fundamental human goodness/empathy. And since the two things are very, very easy to separate it's very, very easy to mostly ignore one in favor of the other. But, people who do so--some of the people who have "lost all faith in humanity" (but paradoxically still seem upset or surprised when something bad happens) or are disgustingly optimistic about all people's motives--are often ignoring a lot of the world they claim or pretend to understand so well. People are capable of both immense good and immense evil. There are the Hitlers and Stalins and Breiviks of the world, but there are also the Gandhis and Mother Teresas and Paul Rusesabaginas.
So I say life is a mixed bag. There's good and bad in all scales imaginable, and it's difficult not to fall into the trap of only seeing one over the other. But, in my eyes, there is fundamentally more good in humanity/humans than evil.
And not quite related, but as of the past few days I seem to have been seeing a lot of people basically calling out the cynics/jaded who repeatedly profess their loss/lack of faith in humanity and how the world/life is bad and all that. I dunno if I just didn't notice it before but I've been seeing a lot of it lately. Wonder where it came from, assuming I haven't just been missing it all this time.