If you are refering to me. Then yes, the shadow temple is really good, probably one of the harder. The boss was one of the best in oot I think. The reason why I do not put it on the top is that it is a little bit to dark I guess.
I have stated before that my favorite temple was the Forest temple. Now I feel different and would probably say the Water temple. Nice boss and mini boss etc. (Spirit temple is also excellent in many ways!)
Worst would be the Fire temple I guess (even though I like that too, are there really...