I was just done with the Fire Temple and I must say that it was really really good.
The sequence to get there was amazing. Scaling Death Mountain using the mine carts, facing Moragia and dodging its fireballs mid-air while piloting the glider...
But the Depths! Oh man, seeing that humongous structure that is the Fire Temple within the Depths, the boiling lakes of lava, the mystical ambience surrounding Gorondia. I had so many questions about the origins of Gorons.
Music was fire (pun intended), the chanting at the beginning of the Fire Temple is so reminescent of OoT I love it. Love the structure, the many floors, the scale of it. Game has been nothing short of stellar on that front. So far I'm done with the Ritos and the Gorons and I can't tell which is my favorite.