You have to keep a few things in mind; primarily, it's an american show, written for an american audience. Second, it's not a show written for hardcore military history buffs.
The caual american viewer doesn't want to hear about how great the "nazi" pilots were, especially if they may have had fathers, grandfathers, brothers or uncles that were shot down by one of the "great" axis pilots.
Nor are they interested in any role the RAF may have had. They, more than likely, see the british as a more powerful naval force, not so much of an air power.
American education, like most countries, tend to focus on the positive inputs that their country had in the war and trivialize the input of other countries. If the show is going to start including the RAF, then it should include the RAAF and the RCAF as well. Heck, most americans don't even realize australia and canada took part in WWII, let alone had an air presence.
-Fred