Terminus
If I was a wizard this wouldn't be happening to me
Which dungeon gave you the biggest problems? What did you like the least and why?
Definitely Beneath the Well. It's not really "creepy", not like the one in OoT, it's more the fact that it's annoying as all hell. I didn't use a walkthrough the first time I went through it, so I didn't have the necessary items to go through it at first. "Y'know, this is a weird well that goes deep beneath the land of the dead, hey maybe I'll need to bring a fish! And some milk! Y'know, could be useful!" - said no one ever.
I liked all of the dungeons.
Depends on how you grade them. Snowhead and Great Bay were more cerebral and better designed, but had frustrating parts. Woodfall Temple was probably more "fun" but was very simplistic.