One thing lost in willy-waving is that a US pilot could fly a long and happy career flying, airliners, corporate jets or ag planes, and never leave the US and, perhaps, Canada. In Europe, such "provincialism" is impossible, you HAVE to deal with non-native English speakers. That's why Aviation English was invented. The FAA Airman's Information Manual has all the correct Aviation English, it's just isn't required on a daily basis and habits die hard.
I agree US pilots sound terrible in Europe and overseas, in general.