It made me want to cry, break my DS, stop playing Zelda, and inflict eternal torture on the programmers of Phantom Hourglass.
It made me begin to hate Zelda as much as I used to love it, to the point that I quit playing and viewing Zelda-related websites for 2-4 months. I couldn't view them without getting angry and disgusted anymore. My passion for OoT eventually got me to come back around, though.
To be honest, though, it really isn't so bad until after the Temple of Ice. After that temple, you've got six full floors of tedious, elaborate, difficult, timed challenges that you can't save. Every time I go to try it, I can't get over how unfair it is, or stop thinking about how upsetting it is that I'll have to start over if I fail.
When I watch a video walkthrough, it feels like there's too much to process, and my brain just reels at all the things I have to do, and how carefully/precisely I have to do them. A text walkthrough would make me feel so bombarded with information that I don't even feel like I have a chance. I WOULD get lost and do the wrong thing. There's just TOO MUCH DATA to deal with at once in this area. Too much sneaking, no saving progress, focusing on time, dual screens of data, and too many overly elaborate schemes for getting past areas.
That, my friend, is what I think of the Temple of the Ocean King.