NYC is an amazing city, particularly if you're willing and able to pay the exorbitant Manhattans rents. Or you're sufficiently socially skilled and/or lucky to partake in the great private welfare system that is rent stabilization (and rent control but that's mostly irrelevant these days).
To me NYC exemplifies Western capitalism, both the good and bad parts. There'd is incredible commerce--and wealth--here. But there's also poverty and homelessness for those tha have fallen through the cracks in the system.
One thing America excels at is service, whether it be retail, restaurants, businesses or whatever. Ther are of course exceptions but for those Americans who complain about service: compare it to most other Western countries and you'll appreciate it that much more.
Despite all that the American experiment seems broken--eve dying. Health care is a disaster (not that I'm necessarily advocating public health care). Social security is a ticking time bomb. Most governments are in serious debt, even to crisis levels. Once you see cities and possibly states default (or just require a bailout) you'll see a fresh eave of financial scandals.
Wall Street seems addicted to debt, to the point of being the engine of financial collapse. Most Americans live beyond their means. America has a number of engineering marvels from the 20th century that look like not being repeated any time soon. They're simply not economical anymore. Think the Moon landings, the Golden Gate bridge, the Hoover Dam, etc.
A lot of the country seems to be in decay. The culture seems increasingly fractured. Honestly it reminds me of the dying days of the Roman Empire. I'm sure there was incredible wealth in Rome the day before it was sacked.
Still, it's hard to argue with a fresh mozzarella slice from Bleecker Street Pizza.
Oh as far as tipping goes, I agree it's strange and I often have to check tipping etiquette in various situations but remember it isn't mandatory (built in service charges in restaurant bills notwithstanding). Example: last week I took a cab from SFO to Mountain View (expensive!) and the driver had no clue. He kept going the wrong way, asking for directions from my phone, ignoring me telling him which exits to take, etc. I didn't feel bad stiffing him on the tip although he still felt entitled to it.