LMAO! IS this for real? The Zelda series is simply consistently good! That's its secret. Show him the reviews for the CDI games.
That being said if you really want to get you friend's panties in a knot then tell him about the actual "Zelda Conspiracy Theory". He'll go ape over it! Though there are two of them and they are kind of inter-changeable but one of them make the game sound like an evil message where the other one makes it sound like a positive message. Interesting enough there's so much evidence to back up the positive one, and Breath of the Wild once again pushes it.
Alternatively you can really rustle his panties by telling your friend that one of the dungeons in the first Zelda game was in the shape of a backwards Swastika. Which is in reality a Manji. Which is Life, Sun, Love, and good things. It's Buddhism symbol but it's actually in many cultures around the world in history. 
