It's not for everyone nothing is. But I think a lot of the time the issues people have are due to how they use it. I have certain personal rules on how I use it eg
I only have on there as friends people I know REALLY well in real life.
I keep on top of my security settings and the only people who can see my stuff are my friends
I rarely join pages or groups
I am careful about what I post and share, I stay aware that it's essentially public
I take regular breaks from looking/posting, I don't need to deactivate or anything to do this I just don't open the app for a few days
I find it very useful and nice for staying in touch with my closest (emotionally speaking) friends and family, most of whom are spread to the far flung corners of the globe! (Army brat, military family on one side several of whom have decided to emigrate permanently).
I love seeing their posts about their children, pets, jobs, life experiences etc without it I would likely not see so many lovely pics and comments about the things happening in these peoples lives, because people are busy these days and don't write letters, send photos, cards etc.
If someone posts something I don't like or that upsets me I don't generally comment I just hide the post.
I have unfriended a few people in the past for bigoted and nasty posting styles, which made me a bit sad but I won't tolerate such nonsense in real life or virtually. But this is extremely rare as most of my Facebook friends aren't like this, well none of them are now as I got rid of those who were.
It's all in how you use it. Keep it sensible/positive and you'll be fine
I think a lot of people forget that they can control what and who is on their feed. You can block people, pages and even vaguely content you'd prefer not to see. Following pages, groups etc that wind you up is just daft!