These are extremely personal rather than big commentary. I've just turned 40 so I've thought about the decade a fair bit
The good:
DC 1 in 2010, DC2 in 2012, which changed us from 'just married ha ha we're not really grownups are we ha ha" to... what we are now. It's good. I like it, but it was seismic change.
I changed career and it was a change infinitely for the better. I am happier, get paid more, and feel like there's more scope and future.
I took up a new hobby I love, and there hasn't been a downside. It's full of nice people and I have not encountered drama I couldn't ignore/mute.
There's been some excellent fiction by women, especially in a genre I love. And great graphic novels, too.
Legend of Zelda, Breath of the Wild was an extraordinary change and improvement in a game-system I've loved since I was a kid. I truly had a 'wow, what a time to be alive' moment when I first played it (and on re-plays).
The Bad:
I used to think we could solve/fix the environment issue, and that there was sufficient political will and time.
Now I know it's about living with the damage we've caused and agitating to stop further damage, and I feel a kind of grief and despair about it, if I'm honest. Like, we're powerless because we cannot seem to limit the capitalism which drives fossil fuel consumption, and etc.