I prefer the dungeon layout and quantity in Twilight Princess, around 10-12, counting an optional like the Cave of Ordeals.
Also, it would be great to have a dungeon corresponding to each element in the Zelda series:
-1 Forest dungeon (like the Woodfall Temple, the Forest Temple in TP)
-1 Fire dungeon (like Dragonroost Cavern, Goron Mines or the Fire Temple)
-1 Water dungeon (a mix of the Lakebed Temple and the Great Bay Temple)
-1 Desert dungeon (like Spirit Temple, Arbiter's Grounds or Desert Palace)
-1 Ice dungeon (like Snowhead Temple and the Snowpeak Ruins, or a large version of the Ice Cavern)
-1 Light dungeon (like Temple of Time or Tower of the Gods)
-1 Wind dungeon (like City in the Sky or Palace of Winds)
-1 Darkness dungeon (like Shadow Temple, Earth Temple or Palace of Twilight)
-The final dungeon
Add a second element to any one of the dungeons above: Electric (machinery obstacles), Darkness, etc.
The optional dungeon is mainly a mix of the Cave of Ordeals (facing increasingly difficult enemies), the Savage Labyrinth (the first half is part of the main quest) and the Gerudo Training Grounds (a fair amount of obstacle courses and challenges involved).