Speaking as a native citizen
Cons:
The politicians, certainly. Can't they just accept climate change is real and is happening? For fuck's sake. Among other political topics that I don't feel like getting into.
The over-emphasis on capitalism.
Pros:
It's fairly easy to become a citizen, particularly compared to a lot of European countries. I appreciate the 'born here, you have citizenship' rule regardless of your parents' standing.
THE DIVERSITY: Even with the nation's checkered past with how it's treated immigrants, slaves, and native peoples, I appreciate it's even there at all. In the end I live in a very colorful country. It's made me more aware of the cultures surrounding me and with the past as a tool, I'm more knowledgable of what's ok and what's not when it comes to talking about other races/ethnicities.
For example: God, I've seen a number of stories in which the writers casually describe Asian-based characters as having 'slanted' eyes and I cringe every time. I'm sure it's mostly out of ignorance. (for those who don't know, 'slant' is a pejorative used to call east-asians.)
just a few of my own thoughts.