Misery's generally born of the traveller, not of the destination.
I've flown into the US about six times in the past year, at a variety of airports. I follow the CBP instructions, have all documents ready and treat the officer with that same courtesy, dignity and respect. Which is always reciprocated. It's really not too hard, young Vader.
I too would like to see simpler processes and shorter lines in the arrivals halls. And the forthcoming biometric requirements are ahead of (market-mature) technologies. But if you're seriously suggesting the US immigration experience is the world's worst, you need to see more of this planet.