In the northeast, it seems the controllers love to rapid-fire those radiocalls, often at the expense of clarity, they need to realize that foreign carriers are not in tune with the clipped slang they use over there.
You often hear them repeat 3 or 4 times, which makes you wonder if it wouldn't be better to say those clearances more slowly and clearly, so they can be read back correctly the first time.
Another thing is that the atc controllers there have this lovely new york attitude, and can seem quite intimidating/overbearing at times, a quality that can work badly with some cultures.