Does the stealth in The Great Circle feel incredibly unfair or am I just bad?

I'm in Gizeh right now and it's like I can't go 10 feet without getting spotted by a nazi. Was there a disguise I was supposed to get somewhere? It's like they can spot you from the other side of a dark tomb and are positioned specifically so you can't get by unnoticed. "Yeah, that's realistic." Sure, for an actual military outpost, not a stealth game.