This is meant to be a bit light-hearted, before I go on.
I mean, life for most people is actually pretty rubbish (or at the very least, could be immeasurably better), and if you were some sort of omnipotent being, wouldn't you have done a better job of us...? 
Just everything, really.
Life for the past millennia or so has been nothing much more than hard slog for everyone except for a teeny, tiny minuscule percentage of folk in the upper echelons of society.
Human beings themselves are so incredibly flawed. It seems to be so much easier for us to be, at best, ambivalent towards our felllow humans and animals and, at worst, downright unkind and cruel.
We have set ourselves up, societally, in a way that doesn't work for so many people. We've denigrated and ensalved whole races of people for absolutely no reason, other than the colour of the skin. Historically, we've been brutal to disabled people. We've sidelined gay people. Women do the lion's share of the housework even when they work and often feel unfulfilled and resentful about it. And men just do not get it. Mums and Dads work full time and hardly see their children.
In fact, work, full stop. We've arranged things so that we spend the best part of our lives working, rather than living. If you're lucky, it's a rewarding enterprise for you, but you'd be in a minority to genuinely be in that category.
Violence is an unfortunate part of many people's lives and they seem unable to escape from that.
Most people don't have enough money to be truly comfortable. Many people don't have enough money to do more than exist.
The amount of cleaning that is required, as part of being a human being. Cleaning self, cleaning clothes, cleaning things, eradicating grime and dust from one's living environment. Wiping down after oneself - it is never-ending, and nobody actually wants to do it, day-in-day-out.
Babies. They're born, and then they set about crying and being extremely needy from day one. The change to one's life when one becomes a parent is profound, and the need to put yourself second is all-consuming. Human babies can't even toilet themselves for the best part of their first two years of life.
We suffer pain. Physical pain and emotional pain. Sometimes pain that we never escape from. And the end of our life, whether short or long, is pretty much inevitably accompanied by pain.
We're socialised to keep so much to ourselves and not burden other people. So often, as adults we do things we don't want to do (and don't do things we do want to do), because that is part and parcel of being a grown-up.
We've designed our relationships to be monogamous, and for life, and although we're gradually moving away from that model, we still don't seem to have it right. So many people cheat on their partners from within this monogamous model, because the allure of the 'new' is so great. Sex lives dwindle, and the number of people having genuinely mind-blowing sex, every time, with someone they've been with for aeons (as opposed to someone they've just recently connected with) is small. Human beings, generally speaking, seem to experience far greater sexual chemistry and satisfaction from new partners, rather than old. People stay together unhappily because the fear of being single is so great.
I know there is a lot of good, and beauty, in the world. But on the other hand, generally, most people pretty much just exist, going through each day, getting older and older until they die.
I know people are probably going to ask if I'm maybe suffering from depression - I'm not! But I just wonder about this stuff from time-to-time.
If you were a supernatural being, don't you think you would have organised things a hell of a lot better...?
The most annoying part of it all is - it's 100s, possibly 1000s of years before we, humans, figure things out - how we got here, and what the meaning of life is. By which time those of us populating the planet right now, will all be dust, and none the fookin' wiser. 