I'll try and answer as a non-America (never been to America and don't have any family history of American citizenship at all).
The usual issues came up like healthcare, customer service tipping, guns, lack of decent public transportation system to not liking George W. Bush and Donald Trump. Common likes are its fatty food to its landscape. The dislikes are virtually the same, but if there's one thing that always makes me think "how peculiar" is complaints about the country's religiosity.
HealthcareThere is a lot about the US Healthcare system that I don't know about, we are always obviously told the stories of poor people with treatable illnesses being left out in the cold so to speak, which always sparks a sense of injustice and the idea of a bad system, I don't know how often such a thing happens as there should be some kind of recourse or safety net for such people IMO to get the treatment they need. We are also witnessing the damage the major pharmaceutical companies are inflicting on us in making profitability their number one goal, as a "cure" is a bad investment and a lifetime treatment is more profitable, or a treatment for one illness only to cause another as a side effect is also more profitable etc, warping health entirely.
That being said, the healthcare system we have in Australia for example is not without it's major problems and given COVID 19 have really come to light. A centralized heavily government controlled system can turn on you at the flick of a switch. As the old saying goes, if your not paying for the product then you are the product... and what's so great about our system (sarcastic) is that I have to cover half the costs anyway, so I am still paying for it (maybe not as much) and without as much control as you might have in terms of your healthcare treatment and options.
Either way, both systems have been thoroughly trashed IMO during covid19 because even in the US they were centralizing control and banning effective treatments like Hydroxychloroquine and Ivermectin. And given how both Countries are all signing away their sovereignty to the WHO is a moot point at this stage IMO.
customer service tippingVehemently against it and very thankful we don't have such a system in Australia. It encourages the worst like "Hooters" behavior IMO and when the chef prepares a meal we don't pay the chef 'whatever we feel like' in the same way, the workers should have their wages included in the cost of the end product IMO as they were part of the end product, neither do we pay delivery drivers 'whatever we feel like', they have a certain price for delivery that is added to the final product.
GunsIt was introduced when the USA had musket rifle, cannons etc technology and off the back of a civil war for independence, the technology has advanced a lot since then and we can never own the same weaponry the government has at it's disposal today but we should always err on the side of freedom, and there are always restrictions, even in the USA, Australia for example has very stupid and ridiculous restrictions on guns, but we don't have high capacity guns and they must be under lock and key. It's a very deep topic IMO with a lot of pro's and con's.
One thing that gets me though, is if your going to have gun rights, people should be carrying them to prevent mass shooters, since if the average citizen has a gun you can't wait for police to show up and resolve it because by then it's too late.
What would annoy me, is being told I couldn't carry a gun while guns are numerous and a criminal could sneak one in.
lack of decent public transportation systemI never use public transport anyway so I wouldn't know.
George W. Bush and Donald TrumpI don't like G W Bush, he lied about WMD's in Iraq and a host of other things and with Romney and McCain, it really showed both major parties were just two sides of the same coin, same thing happening in Australia, it doesn't even matter which of the two major parties gets in anymore as the end result is the same.
Donald Trump thankfully changed that a lot though, and I very much supported him, even with his major mistakes such as the jab. As long as it's not mandatory and is entirely voluntary, they can knock themselves out with their stupidity (It was sad at the start when little was known, but now to be on the booster train given what we know today is just stupidity IMO). It's the coercion and force that is truly evil and unacceptable.
USA's religiosityI'm a big believer in what Ronald Raegan said, the moment the USA (I would say the western world) forgets that they are one nation under God, they will be one nation gone under... and we are almost at that point IMO.
And when I say God, I don't mean multiculturalism or anything, I mean Our Lord Jesus Christ, when the western world was founded on God, it wasn't Islam or Judaism or Buddhism or whatever, it was Christianity. Multi-racial yes but multi-cultural no, different races and cultures are all good and enriching things ONLY if there is a fundamental truth that unites them in the one Country, which is or used to be at least Christianity for the western world.
When Christianity falls in the western world, so too will the western world fall as we are currently witnessing IMO.
And of course, Christianity only works when entirely voluntary. So can't make or coerce people to become Christian, but with that understanding one can't flood a Country with those of another faith and not expect problems, neither can one expel those of another faith from the Country, because then that's fake conversion. Need an environment that facilitates the growth of Christianity, all Constantine the Great had to do was legalize the faith throughout the empire and not persecute it at all.
God Bless