I did actually like Ikana castle. The atmosphere was OK and it was just... Fun to do, not especially hard or so. However, NOT nice to be on top without a powder keg :'D
I loved Stone Tower, Great Bay was also very challenging for me, when I was young it took me quiet a while, the longest of every Zelda dungeon, to finish it. Altough now I understand you should just follow pipelines. But is was confusing, and I still love it.
Snowhead was also brutal, really some nice puzzling, and if you missed something or fell down you were screwed. Woodfall was ok, very nice first dungeon, not too hard, but I enjoyed it the least. But in the end all the dungeons were brilliant, some of the best in the series, altough there are only four.
The well in Ikana was pretty irritating by the way, but it made you feel good when finished