I'm lost. ;_; I saw Ruto, got the small key, then got another small key, got the map, got the compass, used both small keys. One on the lowest door and the other on the 2nd floor's door.
Aren't you talking here about Jabu Jabu's Belly? I can't remember encountering Ruto in the Water Temple until the end, when she awakens as a sage. It has been a while tough.
I don't really have a temple I hate the most, but there are some rooms, puzzles and bosses I don't want to repeat. For example rooms with torches that are a limited time lit and the door will only open if all the torches are lit and you have to hurry to get through those doors or they'll close again. One such room is in TMC's Temple of Droplets and in ALttP's Turtle Rock.
Don't read if you haven't finished Twilight Princess.
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As a puzzle I didn't like was in TP's City in the Sky. There is a room with a large door leading to the Boss. The switch to open it is on the roof which you can't reach with the clawshot. You have to stop the fan in the ceiling and lower yourself from the room above. My problem is that I always forgot it and jumped down. Could I work my self up again.
Manhandalla in OOS was a really hard boss. The first time I played, I died about a hundred of times before I knew how to kill him. I asked people I know about how to deal with him, but the only answer I got was: "Have patience and pray your lucky." Well after a hundred times stopped playing OOS for a year and a half. I played it again and finally saw the freaking patterns with just one time dying. I learned my lesson.
Overall I have to say that the Oracle series have the more challenging dungeons. In the Zelda series.