Offline=easy kills, online= hard kills...... that's a load if I ever heard it. Too many assumptions being made without regard to the given player and their setup.
However, I do agree that it's easy to setup in Wonder Woman view and shoot away like a pro just for the sake of creating a movie about an airplane and it's status in history. Does not matter if the person who created it was doing everything they could to get easy kills if the prime reason was to show how good the Experten were in WWII IF that was the focus of their movie making.
But if they pass it on as their skills under full realism, then anyone who does claim will face detailed criticizing and that's just a natural progression of being that good. If they truly do well, they should stand up just fine under criticizing Flight Simmers.