What makes me like Zelda is the Story and the dugeon solving. It has an amazing story and great gameplay that you wont want to put the controller down.
I love the Zelda series so much because of the sense of adventure you get from the gameplay. I also love the freedom to go wherever you want when you want to go there.
There were a couple things that, last year, made me like Zelda. Now, though, the thing that makes me like Zelda is the difficulty more than anything. That's one of the couple reasons why I'm disliking the more recent releases, because they're too easy.