for me all of the temples were easier than the water temple...during my first run of the game I got to the water temle and got so frustrated with it I didn't play for like a month and a few days, after that I was SO lost so I stopped playing...after that I waited some months and decided to play the game again from scratch and that time I did finally go trough it and moved on (finished the game of course) ...but water temple was definitely the hardest of all because it was so annoying!!!
I still haven't played master quest, I'm trying to get an original copy of it....