America definitely has its problems, but I will still much rather that America be the dominant superpower and not China or Russia. If you want to see a sample of what a world dominated by China and Russia would look like, you can look no further than what's happening in Ukraine right now.
Not to mention, America is the only country that actually tries to genuinely live up to the ideal of freedom of speech. The profound respect for civil liberties in America is something that you simply won't find anywhere else in the world, and it's easily my favorite thing about this country.