To be quite honest, I don't know too many Americans who say America is "the best country ever." In fact, lately, I've seen loads of Americans voicing just the opposite opinion. I'm an American who has actually lived in another country. From that experience, all countries have their benefits and their detriments. And the citizens of most countries will have love for their homeland and consider it the best place for them to live. Isn't that fairly normal? I understand judging people who make blanket statements, but sometimes it's more a clearly personal statement or hyperbole. Really, though, most Americans don't say that.
Those graphs show some of the bad things about our country. I will say that maternity leave is crap. I had a coworker who had to pool all of her vacation, sick, and personal days for her "maternity leave." She worked until her due date, the baby was a week late, and she only had four weeks to spend at home. This isn't really the status quo, though. Most places provide maternity time. Some even provide paternity time. I just work for a bunch of douche bags.