For many of us with European ancestry, the ethnicity labels from Ancestry's autosomal test don't appear to be very accurate or helpful as far as our known ancestry in the past few hundred years. If you read through some of the other threads, you'll see that even some parents and children have very different ethnicity results! I have decided to ignore my own ethnicity categories.
The MATCHES are a different story. Those with public-and-populated trees can be very helpful and they are what is great about Ancestry's autosomal test!