I knew someone would ask that question sooner rather than later. It's hard to answer though. Breath of the Wild is so different from the other games. I can say that as a gaming experience it will rank very high. Higher than anything in a long time. As a Zelda game, I'm not sure yet where exactly, it will come down to the main dungeons and bosses (no spoiling please), of which I'm approaching the first one. Even after around 40 hours of play-time, I've yet to visit a single one. I've mentioned which games are my favorites countless times now, but to put Breath of the Wild in context, I'm fairly sure when all is said and done it will fall around here (top 10 only);
1. Ocarina of Time, remains indesputably the quintessential game, balancing out every element the series needs to perfection.
2. Link's Awakening
3-6. Breath of the Wild, if the dungeons are real "Zelda" (again, please no spoiler), it will work in this game's favor, if that part as well is as different from the rest of the series as the rest of the game is it will slightly start to work against it in my all-time ranking of Zelda games. Zelda's my favorite franchise, and it is as such because of a few elements. There will be a point where too much difference indeed is, too much. That point isn't here yet though.
3-4. Twilight Princess, my current #3, which for a sizable part is at this spot because of it's dungeons and bosses. Breath of the Wild can actually beat this amazing game in my ranking if I find it's dungeons and bosses "good enough". This coincidentally also means Breath of the Wild would be in my top 10-15 favorite games overall.
4-5. Majora's Mask
5-6. A Link to the Past
7. Skyward Sword, no matter what happens still, Breath of the Wild is already better than this game.
8. A Link Between Worlds
9. The Wind Waker
10. The Legend of Zelda NES