I think many people like the zelda franchise (So do I) and might score a game better because they love the series and have a connection with the franchise.
Zelda Breath of the Wild is a very good game, is it one of the best games ever made, Not sure. Its one of the best Zelda games and a must play in my opinion for sure.
New gamers especially younger once will not have the same connection and generally will just compare it with other things they recently played and they might favour a graphical powerhouse like Horizon Zero dawn or a more mature take like The Witcher did and rate Zelda lower then that.
Obv. there is some bias in both critic and user score but in general critic score is a better reflection then user score will ever be, since some people will just downvote a game because they don't own or like the system its made on or dislike nintendo, xbox or ps in general.
But in the end its not important, Like I said Zelda is a good game and most people who pick it up know what to expect and will just love/like the game :)
Twitter @CyberMalistix
