Sorry for the break, I had to go back to work...
I would be a fool to say that ALL comms across the U.S. are totally professional and have no room for improvement. We do push a decent amount of traffic and at times, our phraseology is sub par (for some of us, quite regularly), but to say that the U.S. has the worst around the world? I can't really agree with that.
Maybe you've watched "Pushin' Tin" too many times.
I realize that having a common hymn sheet for all isn't a bad thing, but to say that L U A W is easy to understand and removes ALL chances for confusion is rather sophomoric. The average pilot (and plenty of controllers) has a great ability to mis-understand things, clear or not.
And by the way, have you looked at the taxiways at the majority of U.S. airports at key times of the day? The planes are already 'lined up and waiting'.